dont include unnessary files in module

package.json

@@ -3,6 +3,9 @@
   "description": "Javascript Library for Client-side Encryption with Braintree",
   "version": "1.3.12",
   "main": "target/braintree-1.3.10.js",
+  "files": [
+    "target/"
+  ],
   "repository": {
     "type": "git",
     "url": "git+https://github.com/github/braintree-encryption.git"