Update dependency eslint-plugin-import to v2.18.1 (#480)

Author: renovate[bot]

package-lock.json

@@ -42,7 +42,7 @@
     "del": "5.0.0",
     "eslint": "6.0.1",
     "eslint-config-airbnb": "17.1.1",
-    "eslint-plugin-import": "2.18.0",
+    "eslint-plugin-import": "2.18.1",
     "geckodriver": "1.16.2",
     "istanbul": "0.4.5",
     "mkdirp": "0.5.1",