Syntax fix

.travis.yml

@@ -14,9 +14,9 @@ matrix:
         - mkdir -p build/logs
       after_script:
         - travis_retry php bin/coveralls -v
-        - >
-          curl --silent https://github.com/kleijnweb/swagger-bundle
-            | grep -oP 'https://camo.githubusercontent.com/[0-9a-z]+/[0-9a-z]+'
-            | xargs curl -X PURGE
+        - |
+          curl --silent https://github.com/kleijnweb/swagger-bundle |\
+            grep -oP 'https://camo.githubusercontent.com/[0-9a-z]+/[0-9a-z]+' |\
+            xargs curl -X PURGE
 
   fast_finish: true