Bump eslint

Bumps [eslint](https://github.com/eslint/eslint) from 3.19.0 to 6.8.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v3.19.0...v6.8.0)

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

docs/articles/dsmextra-vignette_files/leaflet-providers-1.1.17/package.json

@@ -26,7 +26,7 @@
   ],
   "devDependencies": {
     "chai": "^4.1.2",
-    "eslint": "^3.16.1",
+    "eslint": "^6.8.0",
     "eslint-plugin-html": "^2.0.1",
     "mocha": "^3.2.0",
     "mocha-phantomjs-core": "^2.1.1",