Bump eslint from 6.5.1 to 6.6.0 (#365)

Bump eslint from 6.5.1 to 6.6.0

package.json

@@ -65,7 +65,7 @@
     "bundlesize": "0.18.0",
     "clean-css-cli": "4.3.0",
     "cross-env": "6.0.3",
-    "eslint": "6.5.1",
+    "eslint": "6.6.0",
     "eslint-config-xo": "0.27.2",
     "eslint-plugin-import": "2.18.2",
     "eslint-plugin-unicorn": "12.1.0",