tweak contributing instructions

Author: shamrin

CONTRIBUTING.md

@@ -69,12 +69,12 @@ You can open pull requests by following the steps:
 
 ## Release Guidelines
 
-Some steps for releasing a new version:
+To release a new version:
 
 1. Update the version in `__version__.py`
-2. Add an entry to the CHANGELOG.md file
+2. Add an entry to the `CHANGELOG.md` file
 3. `git tag v{major}.{minor}.{patch}`
-4. `git push master`
+4. `git push origin master`
 5. `git push --tags`
 6. [Draft and publish](https://github.com/DataCrunch-io/datacrunch-python/releases) a new release.
 7. Check that package is automatically published to [PyPI](https://pypi.org/project/datacrunch/) via [GitHub action](https://github.com/DataCrunch-io/datacrunch-python/actions/workflows/publish_package.yml).