build(Babel): now min node version is 6

nodkz · nodkz · commit 2bf3d75e0a88 · 2017-11-01T16:44:42.000+06:00
diff --git a/.babelrc b/.babelrc
@@ -7,7 +7,7 @@
   "presets": [
     ["env", {
       "targets": {
-        "node": 4
+        "node": 6
       },
     }]
   ],
diff --git a/.travis.yml b/.travis.yml
@@ -11,7 +11,6 @@ node_js:
   - "8"
   - "7"
   - "6"
-  - "4"
 before_install: yarn global add greenkeeper-lockfile@1
 before_script: greenkeeper-lockfile-update
 after_script: greenkeeper-lockfile-upload
