chore: cache dependencies

DanielRuf · DanielRuf · commit 254e2d9c7bec · 2018-05-14T19:40:52.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -17,3 +17,7 @@ before_script:
 
 script:
   - vendor/bin/phpunit
+
+cache:
+  directories:
+    - "$HOME/.composer/cache/files"
