Tweak allow_failures

.travis.yml

@@ -20,9 +20,9 @@ env:
     - KARMA_SAUCE_LABS=1 TEST_TARGET=test-assets
 
 matrix:
+  fast_finish: true
   allow_failures:
-    env:
-      - KARMA_SAUCE_LABS=1
+    - env: KARMA_SAUCE_LABS=1
 
 before_install:
   - nvm install $(python -c "import json; print(json.loads(open('./assets/package.json').read())['engines']['node'])")