Removes duplicate pytest command. Runs sonar scanner only if tests pass.

.travis.yml

@@ -20,12 +20,12 @@ install:
   - pip install pipenv pytest coverage awscli
   - export PATH=$PATH:$HOME/.local/bin;
   - pipenv install
-  - pytest              # <== This runs in Pipenv (a/k/a virtualenv)
 
-# command to run tests
 script:
-  - coverage run -m pytest
-  - coverage xml -i
+  - pipenv run coverage run -m pytest
+  - pipenv run coverage xml -i
+
+after_success:
   - sonar-scanner
 
 deploy: