Fix missing dependency

To export the notes we need the archiver package that takes care of
creating the zip files.

Looks like I forgot this one in the initial commit.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

Author: SISheogorath

package.json

@@ -16,6 +16,7 @@
   },
   "dependencies": {
     "Idle.Js": "git+https://github.com/shawnmclean/Idle.js",
+    "archiver": "^2.1.1",
     "async": "^2.1.4",
     "aws-sdk": "^2.7.20",
     "base64url": "^3.0.0",