Merge pull request #9 from NateRadebaugh/greenkeeper

Update travis config to allow greenkeeper to do its magic

.travis.yml

@@ -1,15 +1,21 @@
 language: node_js
 sudo: false
 os:
-  - linux
-  - windows
+- linux
+- windows
 node_js:
-  - "6"
-  - "8"
-  - "9"
-  - "stable"
+- '6'
+- '8'
+- '9'
+- stable
 script:
-  - npm run lint
-  - npm run test:all
+- npm run lint
+- npm run test:all
 notifications:
   email: false
+before_install: yarn global add greenkeeper-lockfile@1
+before_script: greenkeeper-lockfile-update
+after_script: greenkeeper-lockfile-upload
+env:
+  global:
+    secure: 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