.travis.yml in embulk-input-mongodb-0.5.0 vs .travis.yml in embulk-input-mongodb-0.5.1

@@ -10,9 +10,10 @@
     - MONGO_DATABASE=my_database
     - MONGO_COLLECTION=my_collection
     - MONGO_URI=mongodb://localhost:27017/my_database
 
 sudo: required
+dist: precise
 
 before_cache:
   - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
   - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
 cache: