Update badges (#73)

- crates.io badges are now deprecated: rust-lang/crates.io#2436

Cargo.toml

@@ -18,10 +18,6 @@ include = [
     "/src/**/*",
 ]
 
-[badges]
-travis-ci = { repository = "parasyte/pixels" }
-maintenance = { status = "actively-developed" }
-
 [dependencies]
 thiserror = "1.0.15"
 wgpu = "0.5.0"

README.md

@@ -1,7 +1,9 @@
-[![Documentation](https://docs.rs/pixels/badge.svg)](https://docs.rs/pixels)
-[![Build Status](https://travis-ci.org/parasyte/pixels.svg?branch=master)](https://travis-ci.org/parasyte/pixels)
-[![CI](https://github.com/parasyte/pixels/workflows/CI/badge.svg)](https://github.com/parasyte/pixels)
-[![unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/)
+[![Documentation](https://docs.rs/pixels/badge.svg)](https://docs.rs/pixels "Documentation")
+[![Build status](https://travis-ci.org/parasyte/pixels.svg?branch=master)](https://travis-ci.org/parasyte/pixels "Build status")
+[![CI](https://github.com/parasyte/pixels/workflows/CI/badge.svg)](https://github.com/parasyte/pixels "CI")
+[![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/parasyte/pixels.svg)](http://isitmaintained.com/project/parasyte/pixels "Average time to resolve an issue")
+[![Percentage of issues still open](http://isitmaintained.com/badge/open/parasyte/pixels.svg)](http://isitmaintained.com/project/parasyte/pixels "Percentage of issues still open")
+[![Unsafe forbidden](https://img.shields.io/badge/unsafe-forbidden-success.svg)](https://github.com/rust-secure-code/safety-dance/ "Unsafe forbidden")
 
 ![Pixels Logo](img/pixels.png)