Merge pull request #28 from gabi2/master

additional bug-fix for bnc #893362 (don't log user/password)
Use a more flexible rubygem requirement syntax (bnc#895069)

https://en.opensuse.org/openSUSE:Packaging_Ruby#Format_of_automatically_generated_Provides:_headers
Merge pull request #29 from yast/rubygem-requires

Use a more flexible rubygem requirement syntax (bnc#895069)