chore(deps): update dependency eslint-plugin-import to v2.21.0

Author: renovate-bot

package-lock.json

@@ -34,7 +34,7 @@
   "devDependencies": {
     "eslint": "4.19.1",
     "eslint-config-standard": "11.0.0",
-    "eslint-plugin-import": "2.20.1",
+    "eslint-plugin-import": "2.21.0",
     "eslint-plugin-node": "6.0.1",
     "eslint-plugin-promise": "3.8.0",
     "eslint-plugin-standard": "3.1.0",