Add true ES Module

import {isPR} from 'github-url-detection/esm/index.js'

Author: fregante

.gitignore

@@ -9,4 +9,5 @@ Thumbs.db
 logs
 *.map
 cjs
-esm
+esm/*
+!esm/package.json

esm/package.json

@@ -0,0 +1,3 @@
+{
+	"type": "module"
+}