Cleanup ESLint config

lib/index.js

@@ -5,7 +5,7 @@
  * for that, however as this comes from app.asar it is pre-compiled and is
  * essentially "free" as there is no expensive compilation step.
  */
-// eslint-disable-next-line import/extensions
+// eslint-disable-next-line import/extensions, import/no-extraneous-dependencies
 import { CompositeDisposable } from 'atom';
 
 const lazyReq = require('lazy-req')(require);

package.json

@@ -71,7 +71,6 @@
         "never"
       ],
       "global-require": "off",
-      "import/no-extraneous-dependencies": "off",
       "import/no-unresolved": [
         "error",
         {
@@ -86,7 +85,6 @@
       "atom": true
     },
     "env": {
-      "es6": true,
       "node": true,
       "browser": true
     }