[New] support eslint v7

Author: ljharb

.travis.yml

@@ -20,6 +20,7 @@ env:
   global:
     - TEST=true
   matrix:
+    - ESLINT=7
     - ESLINT=6
     - ESLINT=5
     - ESLINT=4
@@ -39,5 +40,11 @@ matrix:
       env: ESLINT=6
     - node_js: '6'
       env: ESLINT=6
+    - node_js: '4'
+      env: ESLINT=7
+    - node_js: '6'
+      env: ESLINT=7
+    - node_js: '8'
+      env: ESLINT=7
   allow_failures:
     - node_js: '11'

package.json

@@ -47,7 +47,7 @@
     "@typescript-eslint/parser": "^2.24.0",
     "babel-eslint": "^8.2.6",
     "coveralls": "^3.0.9",
-    "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0",
+    "eslint": "^3 || ^4 || ^5 || ^6 || ^7",
     "eslint-config-airbnb-base": "^13.2.0",
     "eslint-plugin-eslint-plugin": "^2.2.1",
     "eslint-plugin-import": "^2.20.1",
@@ -60,7 +60,7 @@
     "typescript-eslint-parser": "^20.1.1"
   },
   "peerDependencies": {
-    "eslint": "^3.0.0 || ^4.0.0 || ^5.0.0 || ^6.0.0"
+    "eslint": "^3 || ^4 || ^5 || ^6 || ^7"
   },
   "engines": {
     "node": ">=4"