Avoid unnecessary travis runs

.travis.yml

@@ -8,6 +8,11 @@ cache:
   directories:
     - $HOME/.m2
 
+branches:
+  only:
+    - master
+    - /support\/.*/
+
 install: travis_retry mvn install -DskipTests=true -B -V
 
 matrix:
@@ -15,7 +20,8 @@ matrix:
     - name: "Build and test"
       script: travis_retry mvn test
     - name: "WhiteSource scan"
-      if: fork = false AND branch = master
+      # only on master and if it is not a PR
+      if: fork = false AND branch = master AND type != pull_request
       script:
         # Download the latest version of WhiteSource FS Agent
         - curl -LJO https://github.com/whitesource/fs-agent-distribution/raw/master/standAlone/whitesource-fs-agent.jar