chore(*): Switch to TravisCI again

Author: HollyPony

.circleci/config.yml

@@ -0,0 +1,14 @@
+dist: trusty
+sudo: false
+language: node_js
+node_js:
+  - 9
+
+before_install: npm install -g greenkeeper-lockfile@1
+before_script: greenkeeper-lockfile-update
+# Only the node version 6 job will upload the lockfile
+after_script: greenkeeper-lockfile-upload
+
+cache:
+  directories:
+    - "node_modules"