Update eslint config

Signed-off-by: Julius Härtl <jus@bitgrid.net>

package.json

@@ -62,10 +62,12 @@
 		"babel-loader": "^8.0.6",
 		"css-loader": "^3.4.0",
 		"eslint": "^6.8.0",
+		"eslint-config-nextcloud": "^0.1.1",
 		"eslint-config-standard": "^12.0.0",
 		"eslint-friendly-formatter": "^4.0.1",
 		"eslint-loader": "^3.0.3",
 		"eslint-plugin-import": "^2.19.1",
+		"eslint-plugin-nextcloud": "^0.3.0",
 		"eslint-plugin-node": "^11.0.0",
 		"eslint-plugin-promise": "^4.2.1",
 		"eslint-plugin-standard": "^4.0.1",