Bump eslint from 4.19.1 to 5.12.1

Bumps [eslint](https://github.com/eslint/eslint) from 4.19.1 to 5.12.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v4.19.1...v5.12.1)
Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -47,7 +47,7 @@
     "end-of-stream": "^1.1.0",
     "escape-html": "^1.0.3",
     "escape-string-regexp": "^1.0.5",
-    "eslint": "^4.19.1",
+    "eslint": "^5.12.1",
     "eslint-config-hypothesis": "^1.0.0",
     "eslint-plugin-mocha": "^5.2.1",
     "exorcist": "^1.0.1",