[DRE-maint] Bug#973516: Include CONTRIBUTORS.md as docs if present

[Lucas Kanashiro]

On Sun, 01 Nov 2020 12:37:28 +0530 Pirate Praveen 
<praveen at onenetbeyond.org> wrote:
 > Package: gem2deb
 > Severity: wishlist
 > Version: 1.4
 >
 > Install CONTRIBUTORS.md as docs if present.

I submitted a fix for that here: 
https://salsa.debian.org/ruby-team/gem2deb/-/merge_requests/13

-- 
Lucas Kanashiro