Bump eslint-plugin-import from 2.18.2 to 2.21.1

Bumps [eslint-plugin-import](https://github.com/benmosher/eslint-plugin-import) from 2.18.2 to 2.21.1.
- [Release notes](https://github.com/benmosher/eslint-plugin-import/releases)
- [Changelog](https://github.com/benmosher/eslint-plugin-import/blob/master/CHANGELOG.md)
- [Commits](import-js/eslint-plugin-import@v2.18.2...v2.21.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -44,7 +44,7 @@
     "coveralls": "3.1.0",
     "eslint": "^4.10",
     "eslint-config-airbnb-base": "13.2.0",
-    "eslint-plugin-import": "2.18.2",
+    "eslint-plugin-import": "2.21.1",
     "get-port": "4.2.0",
     "jsdoc": "3.6.3",
     "jsdoc-to-markdown": "^3.1.0-1",