Wildcard URL for downloading the tool

**Is your feature request related to a problem? Please describe.**
When configuring CI systems, we need to re-deploy the whole instance if we update the tool as the URL of the downloadable jar is version named. For example, https://github.com/google/bundletool/releases/download/1.5.0/bundletool-all-1.5.0.jar

**Describe the solution you'd like**
We would love a wildcard url to be able to get the latest version jar file directly. For example: https://github.com/google/bundletool/releases/download/latest/bundletool-all.jar (that would be actually linked to the one jar above right now).

**Describe alternatives you've considered**
There's no actual alternative to this as this is an infrastructure limitation on our side. Whenever a new jar comes out, we'll need to update the jar URL and re-deploy the CI instance (which has downtime).

Thanks for considering!