fix: remove ESM package.json declaration (fixes `'Element' is not e…

…xported from '@prismicio/richtext'`) (#122)

package.json

@@ -16,16 +16,15 @@
 	"license": "Apache-2.0",
 	"author": "Prismic <contact@prismic.io> (https://prismic.io)",
 	"sideEffects": false,
-	"type": "module",
 	"exports": {
 		".": {
 			"require": "./dist/index.cjs",
-			"import": "./dist/index.mjs"
+			"import": "./dist/index.js"
 		},
 		"./package.json": "./package.json"
 	},
 	"main": "dist/index.cjs",
-	"module": "dist/index.mjs",
+	"module": "dist/index.js",
 	"types": "dist/index.d.ts",
 	"files": [
 		"dist",