💥 drop support for ESLint 4.x

Author: mysticatea

.travis.yml

@@ -12,16 +12,16 @@ node_js:
   - "12"
 
 env:
-  - ESLINT_VERSION=4
   - ESLINT_VERSION=5
+#  - ESLINT_VERSION=6
 
 matrix:
   exclude:
     # Reduce build jobs.
     - os: osx
-      env: ESLINT_VERSION=4
+      env: ESLINT_VERSION=6
     - os: windows
-      env: ESLINT_VERSION=4
+      env: ESLINT_VERSION=6
 
 before_script:
   - npm i --no-save async

README.md

@@ -15,7 +15,7 @@ $ npm install --save-dev eslint eslint-plugin-node
 ```
 
 - Requires Node.js `>=8.10.0`
-- Requires ESLint `>=4.19.1` (`plugin:node/recommended` preset requires `>=5.0.0`)
+- Requires ESLint `>=5.16.0`
 
 **Note:** It recommends a use of [the "engines" field of package.json](https://docs.npmjs.com/files/package.json#engines). The "engines" field is used by `node/no-unsupported-features/*` rules.
 

package.json

@@ -10,7 +10,7 @@
     "lib"
   ],
   "peerDependencies": {
-    "eslint": ">=4.19.1"
+    "eslint": ">=5.16.0"
   },
   "dependencies": {
     "eslint-plugin-es": "^1.4.0",