[docs] Fixed bad path to 'Contributing' md (which was moved).

README.md

@@ -38,7 +38,7 @@ As audio/video packets are streamed from a source to a destination device, SRT d
 * SRT Cookbook: [website](https://srtlab.github.io/srt-cookbook), [GitHub](https://github.com/SRTLab/srt-cookbook)
 * SRT RFC: [txt](https://haivision.github.io/srt-rfc/draft-sharabayko-mops-srt.txt), [html](https://haivision.github.io/srt-rfc/draft-sharabayko-mops-srt.html), [GitHub](https://github.com/Haivision/srt-rfc)
 * [Using the `srt-live-transmit` App](docs/srt-live-transmit.md)
-* [Contributing](docs/Contributing.md)
+* [Contributing](CONTRIBUTING.md)
 * [Developer's Guide](docs/DevelopersGuide.md)
 * [SRT Encryption](docs/encryption.md)
 * [API](docs/API.md)