Download method generates a zip file without extension

[rijatru]

Calling shpWrite.download(geoJson, options) downloads a file named download without the zip extension.

[sheindel]

Good news: v0.4.2 is now available and this issue should be resolved.

Less good news: Mapbox changed their deployment organization so this package is now hosted under a different package

@mapbox/shp-write
https://unpkg.com/@mapbox/shp-write@latest/shpwrite.js