add src to files (#293)

Author: ryanio

package.json

@@ -13,7 +13,8 @@
   "main": "./dist/index.cjs",
   "module": "./dist/index.module.js",
   "files": [
-    "dist"
+    "dist",
+    "src"
   ],
   "scripts": {
     "build": "microbundle",