Update documentation

CONTRIBUTING.md

@@ -8,10 +8,12 @@ If you have encountered a bug, please report it, as we rely on user reports to f
 
 Please also make sure that your issues are helpful. To ensure that your issue is helpful, please read over this brief checklist to avoid the more common pitfalls:
 
-	- Please take a moment to search/read previous similar issues to ensure you aren’t posting a duplicate. Duplicates will be closed immediately.
-	- Please include a clear description of what the issue is. Issues with descriptions such as ‘It hangs after 40 minutes’ will be closed immediately.
-	- Please include, where possible, steps to reproduce the bug, along with any other material that is related to the bug. For example, if librespot consistently crashes when you try to play a song, please include the Spotify URI of that song. This can be immensely helpful in quickly pinpointing and resolving issues.
-	- Lastly, and perhaps most importantly, please include a backtrace where possible. Recent versions of librespot should produce these automatically when it crashes, and print them to the console, but in some cases, you may need to run ‘export RUST_BACKTRACE=full’ before running librespot to enable backtraces.
+- Please take a moment to search/read previous similar issues to ensure you aren’t posting a duplicate. Duplicates will be closed immediately.
+- Please include a clear description of what the issue is. Issues with descriptions such as ‘It hangs after 40 minutes’ will be closed immediately.
+- Please include, where possible, steps to reproduce the bug, along with any other material that is related to the bug. For example, if librespot consistently crashes when you try to play a song, please include the Spotify URI of that song. This can be immensely helpful in quickly pinpointing and resolving issues.
+- Please be alert and respond to questions asked by any project members. Stale issues will be closed.
+- When your issue concerns audio playback, please first make sure that your audio system is set up correctly and can play audio from other applications. This project aims to provide correct audio backends, not to provide Linux support to end users.
+- Lastly, and perhaps most importantly, please include a backtrace where possible. Recent versions of librespot should produce these automatically when it crashes, and print them to the console, but in some cases, you may need to run ‘export RUST_BACKTRACE=full’ before running librespot to enable backtraces.
 
 ## Contributing Code
 
@@ -33,16 +35,21 @@ Unless your changes are negligible, please add an entry in the "Unreleased" sect
 
 Make sure that the code is correctly formatted by running:
 ```bash
-cargo +stable fmt --all
+cargo fmt --all
 ```
 
-This command runs the previously installed stable version of ```rustfmt```, a code formatting tool that will automatically correct any formatting that you have used that does not conform with the librespot code style. Once that command has run, you will need to rebuild the project:
+This command runs ```rustfmt```, a code formatting tool that will automatically correct any formatting that you have used that does not conform with the librespot code style. Once that command has run, you will need to rebuild the project:
 
 ```bash
 cargo build
 ```
 
-Once it has built, and you have confirmed there are no warnings or errors, you should commit your changes.
+Once it has built, check for common code mistakes by running:
+```bash
+cargo clippy
+```
+
+Once you have confirmed there are no warnings or errors, you should commit your changes.
 
 ```bash
 git commit -a -m "My fancy fix"