Drop support for node <4

Author: danez

.travis.yml

@@ -4,8 +4,7 @@ os:
   - linux
   - osx
 node_js:
-  - node
+  - '10'
+  - '8'
   - '6'
-  - '5'
-  - '0.12'
-  - '0.10'
+  - '4'

appveyor.yml

@@ -2,10 +2,10 @@
 environment:
   matrix:
     # node.js
+    - nodejs_version: "10.0"
+    - nodejs_version: "8.0"
     - nodejs_version: "6.0"
-    - nodejs_version: "5.0"
-    - nodejs_version: "0.12"
-    - nodejs_version: "0.10"
+    - nodejs_version: "4.0"
 
 # Install scripts. (runs after repo cloning)
 install:

package.json

@@ -21,7 +21,7 @@
   ],
   "main": "index.js",
   "engines": {
-    "node": ">=0.10.0"
+    "node": ">=4.0.0"
   },
   "scripts": {
     "test": "mocha"