chore: limit module files to lib

package.json

@@ -17,6 +17,9 @@
   "bin": {
     "electron-rebuild": "lib/src/cli.js"
   },
+  "files": [
+    "lib"
+  ],
   "repository": {
     "type": "git",
     "url": "https://github.com/electron/electron-rebuild"