Enable github plugin and use recommended set of rules

Author: koddsson

.eslintrc.json

@@ -1,9 +1,14 @@
 {
   "root": true,
+  "plugins": ["github"],
   "extends": [
     "plugin:github/browser",
+    "plugin:github/recommended",
     "plugin:github/typescript"
   ],
+  "rules": {
+    "github/no-then": "off"
+  },
   "overrides": [
     {
       "files": "test/**/*.js",

src/index.ts

@@ -30,7 +30,6 @@ function task(): Promise<void> {
 
 async function handleData(el: IncludeFragmentElement) {
   observer.unobserve(el)
-  // eslint-disable-next-line github/no-then
   return getData(el).then(
     function (html: string) {
       const template = document.createElement('template')