Remove support for Node 4

.eslintrc.json

@@ -14,7 +14,7 @@
     "no-var": "off",
     "prefer-const": "off",
     "prefer-arrow-callback": "off",
-    "node/no-unsupported-features": ["error", {"version": 4}],
+    "node/no-unsupported-features": ["error", {"version": 6}],
     "func-names": ["error", "always"],
     "prefer-template": "error",
     "object-shorthand": [

.travis.yml

@@ -7,10 +7,10 @@ branches:
     - master
 matrix:
   include:
-    - node_js: "4"
     - node_js: "6"
     - node_js: "8"
       after_success: "bash <(curl -s https://codecov.io/bash)"
     - node_js: "10"
+    - node_js: "12"
 install:
   - yarn install --frozen-lockfile

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## HEAD
+
+- **Breaking change:** Remove support for Node 4.
+
 ## 5.2.1
 
 - Chore: Upgrade `js-yaml` to avoid npm audit warning.

README.md

@@ -63,7 +63,7 @@ If you are still using v4, those v4 docs are available [in the `4.0.0` tag](http
 npm install cosmiconfig
 ```
 
-Tested in Node 4+.
+Tested in Node 6+.
 
 ## Usage
 

appveyor.yml

@@ -1,12 +1,5 @@
 # http://www.appveyor.com/docs/appveyor-yml
 
-environment:
-  matrix:
-    - nodejs_version: 4
-    - nodejs_version: 6
-    - nodejs_version: 8
-    - nodejs_version: 10
-
 branches:
   only:
     - master
@@ -19,8 +12,16 @@ deploy: off
 cache:
  - "%LOCALAPPDATA%\\Yarn"
 
+environment:
+  matrix:
+  - nodejs_version: 6
+  - nodejs_version: 8
+  - nodejs_version: 10
+  - nodejs_version: 12
+
 install:
-  - ps: Install-Product node $env:nodejs_version x64
+  # https://www.appveyor.com/docs/lang/nodejs-iojs/#installing-any-version-of-nodejs-or-iojs
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) x64
   - yarn install --frozen-lockfile
 
 test_script:

package.json

@@ -109,6 +109,6 @@
     "remark-preset-davidtheclark": "^0.7.0"
   },
   "engines": {
-    "node": ">=4"
+    "node": ">=6"
   }
 }