CONTRIBUTING: No changes to the public API

Author: rexim

CONTRIBUTING.md

@@ -1,3 +1,3 @@
-# No Features
+# No changes to the public API (formerly known as "No Features")
 
-PRs that implement new features are not accepted. Only bug fixes are accepted. If you need a certain feature create an issue about it and I may consider implementing it if it's good.
+PRs that change the public API of the library are not accepted. Only PRs that change the internals in a backward compatible way are considered. Changing the public API is only authorized to [@rexim](https://github.com/rexim). If you need a certain feature that requires changing the public API, implement it yourself in your local copy of nob.h or create an issue about it and [@rexim](https://github.com/rexim) may consider implementing it if it's useful.