Updated contribution instructions (#9)

Author: bachya

README.md

@@ -372,6 +372,8 @@ however, the system object(s) will need to be recreated via
 4. Enter the virtual environment: `pipenv shell`
 5. Code your new feature or bug fix.
 6. Write a test that covers your new functionality.
-7. Run tests and ensure 100% code coverage: `make coverage`
-8. Add yourself to `AUTHORS.md`.
-9. Submit a pull request!
+7. Update `README.md` with any new documentation.
+8. Run tests and ensure 100% code coverage: `make coverage`
+9. Run ensure you have no linting errors: `make lint`
+10. Add yourself to `AUTHORS.md`.
+11. Submit a pull request!