docs: Update readme

README.md

@@ -1,15 +1,19 @@
 # puremp3
+
+[![No Maintenance Intended](http://unmaintained.tech/badge.svg)](http://unmaintained.tech/)
 [![crates.io](https://img.shields.io/crates/v/puremp3.svg)](https://crates.io/crates/puremp3)
 [![docs.rs](https://docs.rs/puremp3/badge.svg)](https://docs.rs/puremp3)
 [![CircleCI](https://circleci.com/gh/Herschel/puremp3.svg?style=svg)](https://circleci.com/gh/Herschel/puremp3)
 
 An MP3 decoder written in pure Rust.
 
+This project is currently unmaintained and probably not suitable for production. Pull requests are accepted.
+
 The motivation for this crate is to create a pure Rust MP3 decoder that easily compiles to the `wasm32-unknown-unknown` target. No claims are made to accuracy, performance, or compatibility. For a more robust decoder, try [minimp3-rs](https://github.com/germangb/minimp3-rs).
 
 ## Support
 
-* MPEG-1/MPEG-2/MPEG-2.5 Layer III
+- MPEG-1/MPEG-2/MPEG-2.5 Layer III
 
 ## Example
 
@@ -25,19 +29,19 @@ for (left, right) in samples {
 
 The following implementations and documents were referenced in creating this crate:
 
- * [PDMP3](https://github.com/technosaurus/PDMP3)
- * [OpenMP3](https://github.com/audioboy77/OpenMP3)
- * [minimp3](https://github.com/lieff/minimp3)
- * [minimp3-rs](https://github.com/germangb/minimp3-rs)
- * [Let's build an MP3-decoder!](http://blog.bjrn.se/2008/10/lets-build-mp3-decoder.html)
- * [MP3 Decoder Master's Thesis](https://sites.google.com/a/kmlager.com/www/projects)
- 
+- [PDMP3](https://github.com/technosaurus/PDMP3)
+- [OpenMP3](https://github.com/audioboy77/OpenMP3)
+- [minimp3](https://github.com/lieff/minimp3)
+- [minimp3-rs](https://github.com/germangb/minimp3-rs)
+- [Let's build an MP3-decoder!](http://blog.bjrn.se/2008/10/lets-build-mp3-decoder.html)
+- [MP3 Decoder Master's Thesis](https://sites.google.com/a/kmlager.com/www/projects)
+
 ## License
 
 Licensed under either of
 
- * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
- * Creative Commons CC0 1.0 Universal Public Domain Dedication ([LICENSE-CC0](LICENSE-CC0) or https://creativecommons.org/publicdomain/zero/1.0/)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+- Creative Commons CC0 1.0 Universal Public Domain Dedication ([LICENSE-CC0](LICENSE-CC0) or https://creativecommons.org/publicdomain/zero/1.0/)
 
 at your option.