Added triggers for react native testapp (#381)

Summary:

Added triggers to run react native Full stack tests on react native testapp.

Author: zashraf1985

.travis.yml

@@ -73,6 +73,10 @@ jobs:
         - CLIENT=node $HOME/travisci-tools/trigger-script-with-status-update.sh
         - CLIENT=browser $HOME/travisci-tools/trigger-script-with-status-update.sh
       after_success: travis_terminate 0
+    - <<: *integrationtest
+      script:
+        - CLIENT=react-native-android REPO_SLUG=optimizely/react-native-testapp $HOME/travisci-tools/trigger-script-with-status-update.sh
+        - CLIENT=react-native-ios REPO_SLUG=optimizely/react-native-testapp $HOME/travisci-tools/trigger-script-with-status-update.sh
     - <<: *integrationtest
       stage: 'Benchmarking tests'
       env: FULLSTACK_TEST_REPO=Benchmarking