[Travis] Add sonarcloud addon.

Token was added in the repository settings in Travis

.travis.yml

@@ -5,3 +5,10 @@ install:
   pip install -r requirements.txt
 script:
   - ./scenario_generator
+
+addons:
+  sonarcloud:
+    organization: "hbrs-maas-github" # the key of the org you chose at step #3
+script:
+  # other script steps might be done before running the actual analysis
+  - sonar-scanner