Run pod repo update before install

Author: koke

.travis.yml

@@ -5,6 +5,6 @@ notifications:
   email: true
 sudo: false
 before_script:
-  - cd Example && pod install && cd -
+  - cd Example && pod repo update && pod install && cd -
 script:
   - set -o pipefail && xcodebuild -workspace Example/EditorDemo.xcworkspace -scheme EditorDemo -sdk iphonesimulator | xcpretty