Add eslint-plugin-import for import/no-duplicates rule

Fixes: standard/standard#599
Fixes: standard/standard#712

`import/no-duplicates` replaces the core rule `no-duplicate-imports`.

README.md

@@ -32,7 +32,7 @@ official ESLint website.
 To use the JavaScript Standard Style shareable config, first run this:
 
 ```bash
-npm install --save-dev eslint-config-standard eslint-plugin-standard eslint-plugin-promise
+npm install --save-dev eslint-config-standard eslint-plugin-standard eslint-plugin-promise eslint-plugin-import
 ```
 
 Then, add this to your .eslintrc file:

eslintrc.json

@@ -14,8 +14,9 @@
   },
 
   "plugins": [
-    "standard",
-    "promise"
+    "import",
+    "promise",
+    "standard"
   ],
 
   "globals": {
@@ -65,7 +66,6 @@
     "no-dupe-class-members": "error",
     "no-dupe-keys": "error",
     "no-duplicate-case": "error",
-    "no-duplicate-imports": "error",
     "no-empty-character-class": "error",
     "no-empty-pattern": "error",
     "no-eval": "error",
@@ -173,10 +173,12 @@
     "yield-star-spacing": ["error", "both"],
     "yoda": ["error", "never"],
 
+    "import/no-duplicates": "error",
+
+    "promise/param-names": "error",
+
     "standard/object-curly-even-spacing": ["error", "either"],
     "standard/array-bracket-even-spacing": ["error", "either"],
-    "standard/computed-property-even-spacing": ["error", "even"],
-
-    "promise/param-names": "error"
+    "standard/computed-property-even-spacing": ["error", "even"]
   }
 }

package.json

@@ -12,6 +12,7 @@
   },
   "devDependencies": {
     "eslint": "^3.8.1",
+    "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^2.0.1",
     "tape": "^4.6.0"
@@ -47,6 +48,7 @@
   "main": "index.js",
   "peerDependencies": {
     "eslint": ">=3.8.1",
+    "eslint-plugin-import": ">=2.2.0",
     "eslint-plugin-promise": ">=3.5.0",
     "eslint-plugin-standard": ">=2.0.1"
   },