Update README.md to be more like the Linebender style (#26)

README.md

@@ -1,19 +1,26 @@
-## simplecss
-![Build Status](https://github.com/RazrFalcon/simplecss/workflows/simplecss/badge.svg)
+<div align="center">
+
+# SimpleCSS
+
+**A simple [CSS 2.1](https://www.w3.org/TR/CSS21/) parser and selector.**
+
+[![Linebender Zulip, #resvg channel](https://img.shields.io/badge/Linebender-%23resvg-blue?logo=Zulip)](https://xi.zulipchat.com/#narrow/channel/465085-resvg)
+[![dependency status](https://deps.rs/repo/github/linebender/simplecss/status.svg)](https://deps.rs/repo/github/linebender/simplecss)
+[![Apache 2.0 or MIT license.](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)](#license)
+[![Build status](https://github.com/linebender/simplecss/workflows/CI/badge.svg)](https://github.com/linebender/simplecss/actions)
 [![Crates.io](https://img.shields.io/crates/v/simplecss.svg)](https://crates.io/crates/simplecss)
-[![Documentation](https://docs.rs/simplecss/badge.svg)](https://docs.rs/simplecss)
-[![Rust 1.37+](https://img.shields.io/badge/rust-1.37+-orange.svg)](https://www.rust-lang.org)
+[![Docs](https://docs.rs/simplecss/badge.svg)](https://docs.rs/simplecss)
 ![](https://img.shields.io/badge/unsafe-forbidden-brightgreen.svg)
 
-A simple [CSS 2.1](https://www.w3.org/TR/CSS21/) parser and selector.
+</div>
 
 This is not a browser-grade CSS parser. If you need one,
 use [cssparser](https://crates.io/crates/cssparser) +
 [selectors](https://crates.io/crates/selectors).
 
 Since it's very simple we will start with limitations:
 
-### Limitations
+## Limitations
 
 - [At-rules](https://www.w3.org/TR/CSS21/syndata.html#at-rules) are not supported.
   They will be skipped during parsing.
@@ -23,27 +30,59 @@ Since it's very simple we will start with limitations:
 - Parser is case sensitive. All keywords must be lowercase.
 - Unicode escape, like `\26`, is not supported.
 
-### Features
+## Features
 
 - Selector matching support.
 - The rules are sorted by specificity.
 - `!important` parsing support.
 - Has a high-level parsers and low-level, zero-allocation tokenizers.
 - No unsafe.
 
-### License
+## Minimum supported Rust Version (MSRV)
+
+This version of SimpleCSS has been verified to compile with **Rust 1.65** and later.
+
+Future versions of SimpleCSS might increase the Rust version requirement.
+It will not be treated as a breaking change and as such can even happen with small patch releases.
+
+<details>
+<summary>Click here if compiling fails.</summary>
+
+As time has passed, some of SimpleCSS's dependencies could have released versions with a higher Rust requirement.
+If you encounter a compilation issue due to a dependency and don't want to upgrade your Rust toolchain, then you could downgrade the dependency.
+
+```sh
+# Use the problematic dependency's name and version
+cargo update -p package_name --precise 0.1.1
+```
+</details>
+
+## Community
+
+[![Linebender Zulip, #resvg channel](https://img.shields.io/badge/Linebender-%23resvg-blue?logo=Zulip)](https://xi.zulipchat.com/#narrow/channel/465085-resvg)
+
+Discussion of SimpleCSS development happens in the Linebender Zulip at <https://xi.zulipchat.com/>, specifically the [#resvg channel](https://xi.zulipchat.com/#narrow/channel/465085-resvg).
+All public content can be read without logging in.
+
+## License
 
 Licensed under either of
 
 - Apache License, Version 2.0
-  ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+   ([LICENSE-APACHE](LICENSE-APACHE) or <http://www.apache.org/licenses/LICENSE-2.0>)
 - MIT license
-  ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+   ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
 
 at your option.
 
-### Contribution
+## Contribution
+
+Contributions are welcome by pull request. The [Rust code of conduct] applies.
+Please feel free to add your name to the [AUTHORS] file in any substantive pull request.
 
 Unless you explicitly state otherwise, any contribution intentionally submitted
 for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
-dual licensed as above, without any additional terms or conditions.
+licensed as above, without any additional terms or conditions.
+
+[Rust Code of Conduct]: https://www.rust-lang.org/policies/code-of-conduct
+[AUTHORS]: ./AUTHORS