set archiver dependency

Author: doapp-ryanp

package.json

@@ -21,7 +21,7 @@
   },
   "homepage": "https://github.com/doapp-ryanp/serverless-plugin-browserify#readme",
   "dependencies": {
-    "archiver": "^1.1.0",
+    "archiver": "~1.1.0",
     "bluebird": "~3.4.6",
     "browserify": "~13.1.1",
     "fs-extra": "~0.30.0",