[DRE-maint] Bug#747405: missing license in debian/copyright

[Thorsten Alteholz]

Package: ruby-gnome2
Version: 2.2.0-1
Severity: serious
User: alteholz at debian.org
Usertags: ftp
X-Debbugs-CC: ftpmaster at ftp-master.debian.org
thanks

Dear Maintainer,

please add the missing license of:
  goocanvas/sample/demo-fifteen.rb
  goocanvas/sample/demo-primitives.rb
  goocanvas/sample/demo.rb
to debian/copyright.

Thanks!
   Thorsten