dropped support of old node.js versions

.editorconfig

@@ -10,3 +10,6 @@ max_line_length = 100
 [package.json]
 indent_style = space
 indent_size = 2
+
+[*.md]
+max_line_length = 80

.travis.yml

@@ -6,13 +6,6 @@ node_js:
   - "6"
   - "5"
   - "4"
-  - "0.12.0"
-  - "0.11.0"
-  - "0.10.0"
-  - "iojs"
-  - "iojs-3"
-  - "iojs-2"
-  - "iojs-1.0.0"
 before_install:
   - npm config set strict-ssl false
   - npm config set registry="http://registry.npmjs.org/"

CHANGELOG.md

@@ -1,10 +1,12 @@
 Changelog
 =========
 
-v0.5.2
+v0.6.0
 ------
 
 - Updated "devDependencies" versions to fix vulnerability alerts
+- Dropped support of io.js and node.js v0.12.x and lower since new versions of
+  "devDependencies" couldn't work with those old node.js versions
 
 v0.5.1
 ------

package.json

@@ -2,7 +2,7 @@
   "name": "deep-extend",
   "description": "Recursive object extending",
   "license": "MIT",
-  "version": "0.5.2",
+  "version": "0.6.0",
   "homepage": "https://github.com/unclechu/node-deep-extend",
   "keywords": [
     "deep-extend",
@@ -53,8 +53,8 @@
     "test": "./node_modules/.bin/mocha"
   },
   "devDependencies": {
-    "mocha": "4.1.0",
-    "should": "5.2.0"
+    "mocha": "5.2.0",
+    "should": "13.2.1"
   },
   "files": [
     "index.js",