chore(deps): update dependency eslint-plugin-standard to v2.3.1 (#492)

This Pull Request updates dependency [eslint-plugin-standard](https://github.com/xjamundx/eslint-plugin-standard) from `v2.0.1` to `v2.3.1`



<details>
<summary>Release Notes</summary>

### [`v2.3.1`](standard/eslint-plugin-standard@v2.3.0...v2.3.1)
[Compare Source](standard/eslint-plugin-standard@v2.3.0...v2.3.1)


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### [`v2.3.0`](standard/eslint-plugin-standard@v2.2.0...v2.3.0)
[Compare Source](standard/eslint-plugin-standard@v2.2.0...v2.3.0)


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### [`v2.2.0`](standard/eslint-plugin-standard@c9a1dfb...v2.2.0)
[Compare Source](standard/eslint-plugin-standard@c9a1dfb...v2.2.0)


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### [`v2.1.1`](standard/eslint-plugin-standard@v2.1.0...c9a1dfb)
[Compare Source](standard/eslint-plugin-standard@v2.1.0...c9a1dfb)


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### [`v2.1.0`](standard/eslint-plugin-standard@v2.0.1...v2.1.0)
[Compare Source](standard/eslint-plugin-standard@v2.0.1...v2.1.0)


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</details>




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This PR has been generated by [Renovate Bot](https://renovatebot.com).

Author: renovate[bot]

package-lock.json

@@ -60,7 +60,7 @@
     "eslint": "3.19.0",
     "eslint-config-standard": "6.2.1",
     "eslint-plugin-promise": "3.7.0",
-    "eslint-plugin-standard": "2.0.1",
+    "eslint-plugin-standard": "2.3.1",
     "ghooks": "1.3.2",
     "in-publish": "^2.0.0",
     "mocha": "3.5.3",