fix(eslint-plugin): update eslint dependency

Author: yarastqt

packages/eslint-plugin/package.json

@@ -21,7 +21,7 @@
     "test": "mocha tests --recursive"
   },
   "devDependencies": {
-    "eslint": "~3.9.1",
+    "eslint": "^6.3.0",
     "mocha": "^3.1.2"
   }
 }

packages/eslint-plugin/tests/lib/rules/whitelist-levels-imports.js

@@ -6,6 +6,7 @@ const { RuleTester } = require('eslint')
 RuleTester.setDefaultConfig({
   parserOptions: {
     sourceType: 'module',
+    ecmaVersion: 2015,
   },
 })