fixing link references

CHANGELOG.md

@@ -9,4 +9,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - first version of dotnet project
 
 
-[1.0.0]: https://code.80px.com/80px/80px.com/dotnet/helloworld/-/compare/98860ffa...master
\ No newline at end of file
+[1.0.0]: https://code.80px.com/80px/80px.com/dotnet/helloworld/-/compare/98860ffa...main
\ No newline at end of file

README.md

@@ -88,7 +88,7 @@ Time Elapsed 00:00:02.25
 ```
 
 ## Contributing
-See [CONTRIBUTING.md](https://code.80px.com/80px/80px.com/dotnet/helloworld/-/blob/master/CONTRIBUTING.md)
+See [CONTRIBUTING.md](https://code.80px.com/80px/80px.com/dotnet/helloworld/-/blob/main/CONTRIBUTING.md)
 
 ## License
 [MIT](https://choosealicense.com/licenses/mit/)