Expose installed-versions array (including global) #153
Description
Is your feature request related to a problem? Please describe.
Nobody needs (and wants to specify) exact electron version number, and blindly downloading latest version would cause pile of electron versions installed on disk. For now installed versions of electron should be exposed so decision to whether download new electron version or not can be taken.
Describe the solution you'd like
Expose installedVersions array
Describe alternatives you've considered
Limiting to just one exact electron release! (Won't even get patch updates)
Additional context
I discussed the need for implementation of sematic versioning and dependent-extension control in this comment. This should be the immediate thing for now.