upd travis config

Author: Gemorroj

.travis.yml

@@ -17,11 +17,11 @@ env:
         - DEPENDENCIES="high"
         - DEPENDENCIES="low"
     global:
-        - DEFAULT_COMPOSER_FLAGS="--no-interaction --no-ansi --no-progress --no-suggest"
+        - DEFAULT_COMPOSER_FLAGS="--no-interaction --ansi --no-progress --no-suggest --prefer-dist"
 
 cache:
     directories:
-        - $HOME/.composer/cache/files
+        - $HOME/.composer/cache
 
 before_install:
     - composer validate