Chore: Update packages to support ESlint v6 (#979)

* Update packages to support ESlint 6

* Update Node.js requirement to 8.10 and above

* Remove Eslint@5 compatibility check from CircleCI

.circleci/config.yml

@@ -5,7 +5,6 @@ workflows:
       - node-v8
       - node-v10
       - node-v12
-      - node-v12-minimal
 
 version: 2
 jobs:
@@ -43,32 +42,3 @@ jobs:
     <<: *node-base
     docker:
       - image: node:12
-
-  node-v12-minimal:
-    docker:
-      - image: node:12
-    steps:
-      - run:
-          name: Versions
-          command: npm version
-      - checkout
-      - restore_cache:
-          keys:
-            - v2-npm-lock-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "package.json" }}
-      - run:
-          name: Install dependencies
-          command: npm install
-      - save_cache:
-          key: v2-npm-lock-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "package.json" }}
-          paths:
-            - node_modules
-      - run:
-          name: Install eslint 5
-          command: |
-            # We need to execute this command twice because of npm's bug.
-            # See also: https://npm.community/t/error-node-modules-staging-eslint-e7cf6846-node-modules-eslint
-            npm install eslint@5.0.0 acorn@6.0.7 --no-save
-            npm install eslint@5.0.0 acorn@6.0.7 --no-save
-      - run:
-          name: Test
-          command: npm test

docs/user-guide/README.md

@@ -18,8 +18,8 @@ yarn add -D eslint eslint-plugin-vue
 ```
 
 ::: tip Requirements
-- ESLint v5.0.0 or later
-- Node.js v6.5.0 or later
+- ESLint v6.0.0 and above
+- Node.js v8.10.0 and above
 :::
 
 ## :book: Usage

package.json

@@ -40,7 +40,7 @@
     "url": "https://github.com/vuejs/eslint-plugin-vue/issues"
   },
   "engines": {
-    "node": ">=6.5"
+    "node": ">=8.10"
   },
   "peerDependencies": {
     "eslint": "^5.0.0 || ^6.0.0"
@@ -50,15 +50,15 @@
   },
   "devDependencies": {
     "@types/node": "^4.2.16",
-    "@typescript-eslint/parser": "^1.11.0",
-    "acorn": "^7.0.0",
+    "@typescript-eslint/parser": "^2.6.1",
+    "acorn": "^7.1.0",
     "babel-eslint": "^10.0.2",
     "chai": "^4.1.0",
     "eslint": "^6.0.0",
     "eslint-plugin-eslint-plugin": "^2.0.1",
     "eslint-plugin-vue-libs": "^4.0.0",
     "eslint-plugin-vue": "file:.",
-    "eslint4b": "^5.1.0",
+    "eslint4b": "^6.6.0",
     "lodash": "^4.17.4",
     "mocha": "^5.2.0",
     "nyc": "^12.0.2",

tests/integrations/eslint-plugin-import/package.json

@@ -8,8 +8,8 @@
   "author": "Toru Nagashima (https://github.com/mysticatea)",
   "license": "MIT",
   "dependencies": {
-    "eslint": "~3.19.0",
-    "eslint-plugin-import": "~2.3.0",
+    "eslint": "~6.0.0",
+    "eslint-plugin-import": "~2.18.2",
     "eslint-plugin-vue": "file:../../.."
   }
 }