Resolve "Tests on master failing due to new solar mass in LAL"

Closes #446 (closed)

.gitlab-ci.yml

@@ -71,13 +71,13 @@ python-3.7:
       - docs/_build/html/
 
 # test example on python 3.6
-#python-3.6:
-#  stage: test
-#  image: bilbydev/v2-dockerfile-test-suite-python36
-#  script:
-#    - python -m pip install .
-#
-#    - pytest
+python-3.6:
+  stage: test
+  image: bilbydev/bilby_pipe-test-suite-python36
+  script:
+    - python -m pip install .
+
+    - pytest
 
 # Tests run at a fixed schedule rather than on push
 scheduled-python-3.7: