.travis.yml in sym-2.1.2 vs .travis.yml in sym-2.2.0

@@ -1,7 +1,9 @@
 language: ruby
 env:
 - CODECLIMATE_REPO_TOKEN=c71874cc22acffe1e2543d3388d3a96c73a65f0cfe17169dadd8de4a6c062c39
+services:
+- memcached
 rvm:
 - 2.4.0
 - 2.3.3
 script: rake
 notifications: