Update AUTHORS.rst (#36)

### What kind of change does this PR introduce?

Small fix to AUHTORS.rst to properly link to the github profile.

{{cookiecutter.project_slug}}/AUTHORS.rst

@@ -5,7 +5,7 @@ Credits
 Development Lead
 ----------------
 
-* {{ cookiecutter.full_name }} <{{ cookiecutter.email }}> `@{{ cookiecutter.github_username }} `https://github.com/{{ cookiecutter.github_username }}>`_
+* {{ cookiecutter.full_name }} <{{ cookiecutter.email }}> `@{{ cookiecutter.github_username }} <https://github.com/{{ cookiecutter.github_username }}>`_
 
 Co-Developers
 -------------