Specify build-version since app store cannot have dupes

Author: kevinsawicki

script/mas.sh

@@ -12,6 +12,7 @@ electron-packager . \
   --platform=mas \
   --app-bundle-id=com.github.electron-api-demos \
   --app-version="$npm_package_version" \
+  --build-version="1.0.3" \
   --arch=x64 \
   --icon=assets/app-icon/mac/app.icns \
   --prune=true \