(#7) Updated Travis config to skip cleanup on depoly

Author: s1hofmann

Diff for: .travis.yml

@@ -53,12 +53,12 @@ before_deploy:
 
 deploy:
   - provider: script
-    skip_cleanup: false
+    skip_cleanup: true
     script: bash ./.build/pre-release.sh
     on:
       branch: develop
   - provider: script
-    skip_cleanup: false
+    skip_cleanup: true
     script: bash ./.build/release.sh
     on:
       tags: true