travis-ci: lint the podspec rather than deploying it on each branch

Author: Steffen Matthischke

.travis.yml

@@ -11,15 +11,18 @@ install:  bundle install
 
 jobs:
   include:
+    - stage: test
+      env: CocoaPods
+      script: pod spec lint ParseLiveQuery.podspec --quick
     - stage: distribution
       env: CocoaPods
+      script: skip
       deploy:
         provider: script
         skip_cleanup: true
         script: ./publish.sh
         on:
           tags: true
-          all_branches: true
     - stage: distribution
       env: Docs
       script: bundle exec jazzy