Remove Node.js v4 and v5 from travis config (#56)

jogold · web-flow · commit bf172bcb639c · 2018-04-13T11:20:16.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -3,8 +3,6 @@ node_js:
   - '8'
   - '7'
   - '6'
-  - '5'
-  - '4'
 before_install:
   - npm install -g npm@5
   - npm install -g greenkeeper-lockfile@1
