fix appveyor build

Author: ActualMandM

appveyor.yml

@@ -1,5 +1,5 @@
 # Appveyor configuration file for bash build of packs
-version: {build}
+version: '{build}'
 environment:
     # It's prefered to have the GithubAuthToken (encrypted) set in the UI. Follow this guide for the instructions https://www.appveyor.com/docs/deployment/github/#provider-settings.
     CommitTimestamp: 0