Update information on implementations

- Added listing of Rust implementation
- Updated link to Python implementation, added mention that development of it is inactive
- Added mention that C implementation development is inactive

README.md

@@ -164,8 +164,9 @@ These are the current implementations of IPFS:
 |----------|---------|--------------|
 | Go | https://github.com/ipfs/go-ipfs | **reference** |
 | JavaScript | https://github.com/ipfs/js-ipfs | **alpha** |
-| Python | https://github.com/ipfs/py-ipfs | starting |
-| C | https://github.com/Agorise/c-ipfs | starting |
+| Rust | https://github.com/rs-ipfs/rust-ipfs | **alpha** |
+| Python | https://github.com/ipfs-shipyard/py-ipfs | starting (inactive) |
+| C | https://github.com/Agorise/c-ipfs | starting (inactive) |
 
 If you would you like to start your own language implementation of IPFS, check out the [IPFS Implementation Guide](https://github.com/ipfs/specs/blob/master/overviews/implement-ipfs.md), and the [Specifications](https://github.com/ipfs/specs). The specs are still evolving, but the core formats are stable and can be built on. Make sure to post an issue if you would like to start an effort, as many people have expressed interest in contributing to new implementations.