Disable DockerHub triggers on PRs

Author: hanefi

.travis.yml

@@ -2,7 +2,7 @@ services: [ docker ]
 stages:
   - build-image
   - name: trigger-dockerhub
-    if: branch = master
+    if: branch = master AND type != pull_request
 env:
   global:
     secure: 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