Never use cached download when cask uses :latest

[vitorgalvao]

Refs #6087.

[adidalal]

Started taking a look at implementing this, even though my Ruby knowledge is pretty minimal. I haven't tested this, but:

The file to change is lib/hbc/download.rb

Under the perform def, add in a simple conditional check above the existing code.

  def perform(force=false)
    downloader.clear_cache if cask.version == :latest
    {snip... rest of code as already exists)
  end

[vitorgalvao]

Sounds about right. Actually, we could make the change further down to downloader.clear_cache if force || cask.version == :latest.

[adidalal]

Opened up a PR, do any tests need to be written?

[vitorgalvao]

Shouldn’t be needed, but always a good idea to let @jawshooah have a look.