Bump eslint from 3.19.0 to 6.6.0

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 6.6.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v3.19.0...v6.6.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -46,7 +46,7 @@
     "babel": "^5.6.14",
     "chai": "1.10.x",
     "cldr-data": ">=25",
-    "eslint": "^3.19.0",
+    "eslint": "^6.6.0",
     "eslint-config-defaults": "^9.0.0",
     "globalize": "^1.3.0",
     "iana-tz-data": ">=2017.0.0",