Fix invalid branch & CI workflow name in README badges (#9)

The name of the branch for the badge URL of the repository changelog was
`master` instead of `main` and the GitHub CI action workflow used the
uppercase name `CI` instead of `ci`.

Fixes GH-8

README.md

@@ -1,8 +1,8 @@
 <p align="center"><img src="https://github.com/svengreb/tmpl-go/blob/main/assets/images/repository-hero.svg?raw=true"/></p>
 
-<p align="center"><a href="https://github.com/svengreb/tmpl-go/releases/latest"><img src="https://img.shields.io/github/release/svengreb/tmpl.svg?style=flat-square&label=Release&logo=github&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a> <a href="https://github.com/svengreb/tmpl-go/blob/master/CHANGELOG.md"><img src="https://img.shields.io/github/release/svengreb/tmpl.svg?style=flat-square&label=Changelog&logo=github&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a></p>
+<p align="center"><a href="https://github.com/svengreb/tmpl-go/releases/latest"><img src="https://img.shields.io/github/release/svengreb/tmpl.svg?style=flat-square&label=Release&logo=github&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a> <a href="https://github.com/svengreb/tmpl-go/blob/main/CHANGELOG.md"><img src="https://img.shields.io/github/release/svengreb/tmpl.svg?style=flat-square&label=Changelog&logo=github&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a></p>
 
-<p align="center"><a href="https://github.com/svengreb/tmpl-go/actions?query=workflow%3ACI" target="_blank"><img src="https://img.shields.io/github/workflow/status/svengreb/tmpl-go/CI.svg?style=flat-square&label=CI&logo=github&logoColor=eceff4&colorA=4c566a"/></a></p>
+<p align="center"><a href="https://github.com/svengreb/tmpl-go/actions?query=workflow%3Aci" target="_blank"><img src="https://img.shields.io/github/workflow/status/svengreb/tmpl-go/ci.svg?style=flat-square&label=CI&logo=github&logoColor=eceff4&colorA=4c566a"/></a></p>
 
 <p align="center"><a href="https://golang.org/doc/effective_go.html#formatting" target="_blank"><img src="https://img.shields.io/static/v1?style=flat-square&label=Go%20Style%20Guide&message=gofmt&logo=go&logoColor=eceff4&colorA=4c566a&colorB=88c0d0"/></a> <a href="https://github.com/arcticicestudio/styleguide-markdown/releases/latest" target="_blank"><img src="https://img.shields.io/github/release/arcticicestudio/styleguide-markdown.svg?style=flat-square&label=Markdown%20Style%20Guide&logoColor=eceff4&colorA=4c566a&colorB=88c0d0&logo=data%3Aimage%2Fsvg%2Bxml%3Bbase64%2CPHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIzOSIgaGVpZ2h0PSIzOSIgdmlld0JveD0iMCAwIDM5IDM5Ij48cGF0aCBmaWxsPSJub25lIiBzdHJva2U9IiNEOERFRTkiIHN0cm9rZS13aWR0aD0iMyIgc3Ryb2tlLW1pdGVybGltaXQ9IjEwIiBkPSJNMS41IDEuNWgzNnYzNmgtMzZ6Ii8%2BPHBhdGggZmlsbD0iI0Q4REVFOSIgZD0iTTIwLjY4MyAyNS42NTVsNS44NzItMTMuNDhoLjU2Nmw1Ljg3MyAxMy40OGgtMS45OTZsLTQuMTU5LTEwLjA1Ni00LjE2MSAxMC4wNTZoLTEuOTk1em0tMi42OTYgMGwtMTMuNDgtNS44NzJ2LS41NjZsMTMuNDgtNS44NzJ2MS45OTVMNy45MzEgMTkuNWwxMC4wNTYgNC4xNnoiLz48L3N2Zz4%3D"/></a> <a href="https://github.com/arcticicestudio/styleguide-git/releases/latest" target="_blank"><img src="https://img.shields.io/github/release/arcticicestudio/styleguide-git.svg?style=flat-square&label=Git%20Style%20Guide&logoColor=eceff4&colorA=4c566a&colorB=88c0d0&logo=git"/></a></p>