chore: bump eslint to ^6.8.0 for emcascriptVersion 2020

Author: rektide

package.json

@@ -124,7 +124,7 @@
     "chai": "^4.2.0",
     "coveralls": "^3.0.3",
     "documentation": "^11.0.0",
-    "eslint": "^5.16.0",
+    "eslint": "^6.8.0",
     "eslint-config-prettier": "^4.3.0",
     "eslint-plugin-jsdoc": "^3.15.1",
     "eslint-plugin-prettier": "^3.1.0",