Switch to new ESLint configuration preset package (#190)

Before the `eslint-config-arcticicestudio-base` NPM package [1] was used
which has been deprecated and somehow also deleted from the registry
after NPM joined GitHub.
Since the goal of the deprecation was to move to the new
`@arcticicestudio/eslint-config-base` package anyway it has now been
switched.

[1]: https://www.npmjs.com/package/eslint-config-arcticicestudio-base
[2]: https://www.npmjs.com/package/@arcticicestudio/eslint-config-base

Author: kremalicious

package-lock.json

@@ -76,10 +76,10 @@
     "package": "vsce package --out nord-visual-studio-code.vsix"
   },
   "devDependencies": {
+    "@arcticicestudio/eslint-config-base": ">=0.5.0 <1.0.0",
     "babel-eslint": "10.0.1",
     "del-cli": "1.1.0",
     "eslint": "5.16.0",
-    "eslint-config-arcticicestudio-base": ">=0.5.0 <1.0.0",
     "eslint-plugin-import": "2.17.3",
     "eslint-plugin-json": "1.4.0",
     "eslint-plugin-prettier": "3.1.0",