Addresses #35 - Fix typos in previous commit

.gitlab-ci.yml

@@ -37,8 +37,8 @@ build_and_deploy_docs:
         - tests
     before_script:
         - pip install awscli
-	- apt update
-	- apt install -y graphviz libgl1-mesa-glx xvfb xdg-utils
+        - apt update
+        - apt install -y graphviz libgl1-mesa-glx xvfb xdg-utils
     script:
         - pip install -r requirements_dev.txt
         - python setup.py install