docs: update contributing guide

Author: slhck

.github/CONTRIBUTING.md

@@ -1,7 +1,5 @@
 # Contributing
 
-The only reason this project exists in its current form is because [@benjaoming](https://github.com/slhck/ffmpeg-normalize/issues?q=is%3Apr+author%3Abenjaoming)'s PRs. Thanks for everyone's support!
-
 ## Features and Bugfixes
 
 If you want to contribute a new feature or fix, please:

README.md

@@ -34,6 +34,8 @@ Check out our [documentation](https://slhck.info/ffmpeg-normalize/) for more inf
 
 ## 🤝 Contributors
 
+The only reason this project exists in its current form is because [@benjaoming](https://github.com/slhck/ffmpeg-normalize/issues?q=is%3Apr+author%3Abenjaoming)'s initial PRs. Thanks for everyone's support!
+
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
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 <!-- markdownlint-disable -->