Update dependency eslint-plugin-import to v2.21.2

Author: renovate-bot

package.json

@@ -120,7 +120,7 @@
     "eslint": "6.1.0",
     "eslint-config-airbnb": "16.1.0",
     "eslint-loader": "1.9.0",
-    "eslint-plugin-import": "2.18.0",
+    "eslint-plugin-import": "2.21.2",
     "eslint-plugin-jsx-a11y": "6.2.3",
     "eslint-plugin-react": "7.14.3",
     "extract-text-webpack-plugin": "4.0.0-beta.0",