feat: drop Node v4 support

gajus · gajus · commit 3a42f2077d4b · 2019-05-15T12:24:51.000+01:00
BREAKING CHANGE: Node.js v4 is no longer supported. Next supported version is v6.
diff --git a/.babelrc b/.babelrc
@@ -8,7 +8,7 @@
       "@babel/preset-env",
       {
         "targets": {
-          "node": 4
+          "node": 6
         }
       }
     ]
diff --git a/.travis.yml b/.travis.yml
@@ -2,6 +2,7 @@ language: node_js
 node_js:
   - node
   - 8
+  - 6
 before_install:
   - npm config set depth 0
 notifications:
diff --git a/package.json b/package.json
@@ -30,7 +30,7 @@
     "semantic-release": "^15.13.3"
   },
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   },
   "husky": {
     "hooks": {
