chore: update dependency eslint to v4.15.0

Author: renovate-bot

package.json

@@ -92,7 +92,7 @@
   },
   "devDependencies": {
     "docsify-cli": "4.2.0",
-    "eslint": "4.14.0",
+    "eslint": "4.15.0",
     "eslint-config-prettier": "2.9.0",
     "husky": "0.14.3",
     "lerna": "2.5.1",

yarn.lock

@@ -2577,9 +2577,9 @@ eslint-visitor-keys@^1.0.0:
   version "1.0.0"
   resolved "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#3f3180fb2e291017716acb4c9d6d5b5c34a6a81d"
 
-eslint@4.14.0:
-  version "4.14.0"
-  resolved "https://registry.npmjs.org/eslint/-/eslint-4.14.0.tgz#96609768d1dd23304faba2d94b7fefe5a5447a82"
+eslint@4.15.0:
+  version "4.15.0"
+  resolved "https://registry.npmjs.org/eslint/-/eslint-4.15.0.tgz#89ab38c12713eec3d13afac14e4a89e75ef08145"
   dependencies:
     ajv "^5.3.0"
     babel-code-frame "^6.22.0"