docs: adding Rerendering doc when having providers (#219)

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<!-- What changes are being made? (What feature/bug is being fixed here?) -->

**What**: issue(#218) Adding to documentation the customRender method when having a provider

<!-- Why are these changes necessary? -->

**Why**: Its still not an option, and the option is not evident

<!-- How were these changes implemented? -->

**How**:  N/A

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**Checklist**: Yes

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- [x] Documentation
- [x] Tests
- [x] Ready to be merged
      <!-- In your opinion, is this ready to be merged as soon as it's reviewed? -->
- [x] Added myself to contributors table
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Author: EstebanMarin

.all-contributorsrc

@@ -577,6 +577,15 @@
         "ideas",
         "review"
       ]
+    },
+    {
+      "login": "EstebanMarin",
+      "name": "EstebanMarin",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/13613037?v=4",
+      "profile": "https://github.com/EstebanMarin",
+      "contributions": [
+        "doc"
+      ]
     }
   ]
 }

README.md

@@ -15,7 +15,7 @@
 [![version][version-badge]][package] [![downloads][downloads-badge]][npmtrends]
 [![MIT License][license-badge]][license]
 
-[![All Contributors](https://img.shields.io/badge/all_contributors-59-orange.svg?style=flat-square)](#contributors)
+[![All Contributors](https://img.shields.io/badge/all_contributors-60-orange.svg?style=flat-square)](#contributors)
 [![PRs Welcome][prs-badge]][prs] [![Code of Conduct][coc-badge]][coc]
 [![Join the community on Spectrum][spectrum-badge]][spectrum]
 
@@ -285,6 +285,24 @@ module.exports = {
 }
 ```
 
+There is the case when you want to wrap your components in a `Provider`, this
+might cause conflicts when `rerender`ed. To achieve this, we suggest the
+`rerender` should be implemented the same way custom queries, by changing the
+return value of the customRender.
+
+```js
+// test-utils.js
+
+const customRender = (node, ...options) => {
+  const rendered = render(<div>{node}</div>, options)
+  return {
+    ...rendered,
+    rerender: (ui, options) =>
+      customRender(ui, {container: rendered.container, ...options}),
+  }
+}
+```
+
 #### Export Issue with Babel Versions Lower Than 7
 
 Babel versions lower than 7 throw an error when trying to override the named
@@ -639,7 +657,11 @@ class TestComponent extends React.Component {
   render() {
     const {count} = this.state
 
-    return <button onClick={() => this.setState({count: count + 1})}>Click to increase: {count}</button>
+    return (
+      <button onClick={() => this.setState({count: count + 1})}>
+        Click to increase: {count}
+      </button>
+    )
   }
 }
 
@@ -913,7 +935,8 @@ Some included are:
 - [`react-router`](https://github.com/kentcdodds/react-testing-library/blob/master/examples/__tests__/react-router.js)
 - [`react-context`](https://github.com/kentcdodds/react-testing-library/blob/master/examples/__tests__/react-context.js)
 
-You can also find react-testing-library examples at [react-testing-examples.com](https://react-testing-examples.com/jest-rtl/).
+You can also find react-testing-library examples at
+[react-testing-examples.com](https://react-testing-examples.com/jest-rtl/).
 
 ## Learning Material
 
@@ -1077,9 +1100,8 @@ libraries. I don't want my tests to wait for animations to end.
 ```javascript
 jest.mock('react-transition-group', () => {
   const FakeTransition = jest.fn(({children}) => children)
-  const FakeCSSTransition = jest.fn(
-    props =>
-      props.in ? <FakeTransition>{props.children}</FakeTransition> : null,
+  const FakeCSSTransition = jest.fn(props =>
+    props.in ? <FakeTransition>{props.children}</FakeTransition> : null,
   )
   return {CSSTransition: FakeCSSTransition, Transition: FakeTransition}
 })
@@ -1315,7 +1337,7 @@ Thanks goes to these people ([emoji key][emojis]):
 | [<img src="https://avatars2.githubusercontent.com/u/5286559?v=4" width="100px;"/><br /><sub><b>Mark Pollmann</b></sub>](https://markpollmann.com/)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=MarkPollmann "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/1213123?v=4" width="100px;"/><br /><sub><b>Ehtesham Kafeel</b></sub>](https://github.com/ehteshamkafeel)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=ehteshamkafeel "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=ehteshamkafeel "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/1493505?v=4" width="100px;"/><br /><sub><b>Julio Pavón</b></sub>](http://jpavon.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=jpavon "Code") | [<img src="https://avatars3.githubusercontent.com/u/1765048?v=4" width="100px;"/><br /><sub><b>Duncan L</b></sub>](http://www.duncanleung.com/)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=duncanleung "Documentation") [💡](#example-duncanleung "Examples") | [<img src="https://avatars1.githubusercontent.com/u/700778?v=4" width="100px;"/><br /><sub><b>Tiago Almeida</b></sub>](https://www.linkedin.com/in/tyagow/?locale=en_US)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=tyagow "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/4982001?v=4" width="100px;"/><br /><sub><b>Robert Smith</b></sub>](http://rbrtsmith.com/)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3Arbrtsmith "Bug reports") | [<img src="https://avatars0.githubusercontent.com/u/1700355?v=4" width="100px;"/><br /><sub><b>Zach Green</b></sub>](https://offbyone.tech)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=zgreen "Documentation") |
 | [<img src="https://avatars3.githubusercontent.com/u/881986?v=4" width="100px;"/><br /><sub><b>dadamssg</b></sub>](https://github.com/dadamssg)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=dadamssg "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/8734097?v=4" width="100px;"/><br /><sub><b>Yazan Aabed</b></sub>](https://www.yaabed.com/)<br />[📝](#blog-YazanAabeed "Blogposts") | [<img src="https://avatars0.githubusercontent.com/u/556258?v=4" width="100px;"/><br /><sub><b>Tim</b></sub>](https://github.com/timbonicus)<br />[🐛](https://github.com/kentcdodds/react-testing-library/issues?q=author%3Atimbonicus "Bug reports") [💻](https://github.com/kentcdodds/react-testing-library/commits?author=timbonicus "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=timbonicus "Documentation") [⚠️](https://github.com/kentcdodds/react-testing-library/commits?author=timbonicus "Tests") | [<img src="https://avatars3.githubusercontent.com/u/6682655?v=4" width="100px;"/><br /><sub><b>Divyanshu Maithani</b></sub>](http://divyanshu.xyz)<br />[✅](#tutorial-divyanshu013 "Tutorials") [📹](#video-divyanshu013 "Videos") | [<img src="https://avatars2.githubusercontent.com/u/9116042?v=4" width="100px;"/><br /><sub><b>Deepak Grover</b></sub>](https://www.linkedin.com/in/metagrover)<br />[✅](#tutorial-metagrover "Tutorials") [📹](#video-metagrover "Videos") | [<img src="https://avatars0.githubusercontent.com/u/16276358?v=4" width="100px;"/><br /><sub><b>Eyal Cohen</b></sub>](https://github.com/eyalcohen4)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=eyalcohen4 "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/7452681?v=4" width="100px;"/><br /><sub><b>Peter Makowski</b></sub>](https://github.com/petermakowski)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=petermakowski "Documentation") |
 | [<img src="https://avatars2.githubusercontent.com/u/20361668?v=4" width="100px;"/><br /><sub><b>Michiel Nuyts</b></sub>](https://github.com/Michielnuyts)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=Michielnuyts "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/1195863?v=4" width="100px;"/><br /><sub><b>Joe Ng'ethe</b></sub>](https://github.com/joeynimu)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=joeynimu "Code") [📖](https://github.com/kentcdodds/react-testing-library/commits?author=joeynimu "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/19998290?v=4" width="100px;"/><br /><sub><b>Kate</b></sub>](https://github.com/Enikol)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=Enikol "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/11980217?v=4" width="100px;"/><br /><sub><b>Sean</b></sub>](http://www.seanrparker.com)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=SeanRParker "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/17031?v=4" width="100px;"/><br /><sub><b>James Long</b></sub>](http://jlongster.com)<br />[🤔](#ideas-jlongster "Ideas, Planning, & Feedback") [📦](#platform-jlongster "Packaging/porting to new platform") | [<img src="https://avatars1.githubusercontent.com/u/10118777?v=4" width="100px;"/><br /><sub><b>Herb Hagely</b></sub>](https://github.com/hhagely)<br />[💡](#example-hhagely "Examples") | [<img src="https://avatars2.githubusercontent.com/u/5779538?v=4" width="100px;"/><br /><sub><b>Alex Wendte</b></sub>](http://www.wendtedesigns.com/)<br />[💡](#example-themostcolm "Examples") |
-| [<img src="https://avatars0.githubusercontent.com/u/6998954?v=4" width="100px;"/><br /><sub><b>Monica Powell</b></sub>](http://www.aboutmonica.com)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=M0nica "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/2699953?v=4" width="100px;"/><br /><sub><b>Vitaly Sivkov</b></sub>](http://sivkoff.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=sivkoff "Code") | [<img src="https://avatars3.githubusercontent.com/u/7049?v=4" width="100px;"/><br /><sub><b>Weyert de Boer</b></sub>](https://github.com/weyert)<br />[🤔](#ideas-weyert "Ideas, Planning, & Feedback") [👀](#review-weyert "Reviewed Pull Requests") |
+| [<img src="https://avatars0.githubusercontent.com/u/6998954?v=4" width="100px;"/><br /><sub><b>Monica Powell</b></sub>](http://www.aboutmonica.com)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=M0nica "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/2699953?v=4" width="100px;"/><br /><sub><b>Vitaly Sivkov</b></sub>](http://sivkoff.com)<br />[💻](https://github.com/kentcdodds/react-testing-library/commits?author=sivkoff "Code") | [<img src="https://avatars3.githubusercontent.com/u/7049?v=4" width="100px;"/><br /><sub><b>Weyert de Boer</b></sub>](https://github.com/weyert)<br />[🤔](#ideas-weyert "Ideas, Planning, & Feedback") [👀](#review-weyert "Reviewed Pull Requests") | [<img src="https://avatars3.githubusercontent.com/u/13613037?v=4" width="100px;"/><br /><sub><b>EstebanMarin</b></sub>](https://github.com/EstebanMarin)<br />[📖](https://github.com/kentcdodds/react-testing-library/commits?author=EstebanMarin "Documentation") |
 
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