[eslint config] [deps] allow eslint v3 or v4

Closes airbnb#1447.

Author: ljharb

.travis.yml

@@ -18,13 +18,16 @@ sudo: false
 env:
   matrix:
     - 'TEST=true ESLINT=3 PACKAGE=eslint-config-airbnb'
+    - 'TEST=true ESLINT=4 PACKAGE=eslint-config-airbnb'
     - 'TEST=true ESLINT=3 PACKAGE=eslint-config-airbnb-base'
     - 'TEST=true ESLINT=4 PACKAGE=eslint-config-airbnb-base'
 matrix:
   fast_finish: true
   include:
     - node_js: "node"
       env: PREPUBLISH=true ESLINT=3 PACKAGE=eslint-config-airbnb
+    - node_js: "node"
+      env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb
     - node_js: "node"
       env: PREPUBLISH=true ESLINT=3 PACKAGE=eslint-config-airbnb-base
     - node_js: "node"
@@ -33,5 +36,6 @@ matrix:
     - node_js: "7"
     - node_js: "5"
     - env: PREPUBLISH=true ESLINT=3 PACKAGE=eslint-config-airbnb
+    - env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb
     - env: PREPUBLISH=true ESLINT=3 PACKAGE=eslint-config-airbnb-base
     - env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb-base

packages/eslint-config-airbnb/package.json

@@ -54,7 +54,7 @@
     "babel-preset-airbnb": "^2.4.0",
     "babel-tape-runner": "^2.0.1",
     "editorconfig-tools": "^0.1.1",
-    "eslint": "^3.19.0",
+    "eslint": "^3.19.0 || ^4.3.0",
     "eslint-find-rules": "^3.1.1",
     "eslint-plugin-import": "^2.7.0",
     "eslint-plugin-jsx-a11y": "^5.1.1",
@@ -65,7 +65,7 @@
     "tape": "^4.7.0"
   },
   "peerDependencies": {
-    "eslint": "^3.19.0",
+    "eslint": "^3.19.0 || ^4.3.0",
     "eslint-plugin-jsx-a11y": "^5.1.1",
     "eslint-plugin-import": "^2.7.0",
     "eslint-plugin-react": "^7.1.0"

packages/eslint-config-airbnb/test/test-react-order.js

@@ -49,8 +49,7 @@ test('validate react prop order', (t) => {
   setBar() {}
   someMethod() {}
   renderDogs() {}
-  render() { return <div />; }
-`));
+  render() { return <div />; }`));
 
     t.notOk(result.warningCount, 'no warnings');
     t.notOk(result.errorCount, 'no errors');