[DRE-maint] Bug#966020: jekyll: ftbfs with ruby-kramdown 2.x in experimental

[Pirate Praveen]

Package: jekyll
Version: 3.8.6+dfsg-3
Severity: important

┌──────────────────────────────────────────────────────────────────────────────┐
│ Checking Rubygems dependency resolution on ruby2.7 │
└──────────────────────────────────────────────────────────────────────────────┘

GEM_PATH=/<<PKGBUILDDIR>>/debian/jekyll/usr/share/rubygems-integration/all:/var/lib/gems/2.7.0:/usr/local/lib/ruby/gems/2.7.0:/usr/lib/ruby/gems/2.7.0:/usr/lib/x86_64-linux-gnu/ruby/gems/2.7.0:/usr/share/rubygems-integration/2.7.0:/usr/share/rubygems-integration/all:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.7.0 
ruby2.7 -e gem\ \"jekyll\"
/usr/lib/ruby/2.7.0/rubygems/dependency.rb:313:in `to_specs': Could not 
find 'kramdown' (~> 1.14) - did find: [kramdown-2.3.0] 
(Gem::MissingSpecVersionError)
Checked in 
'GEM_PATH=/<<PKGBUILDDIR>>/debian/jekyll/usr/share/rubygems-integration/all:/var/lib/gems/2.7.0:/usr/local/lib/ruby/gems/2.7.0:/usr/lib/ruby/gems/2.7.0:/usr/lib/x86_64-linux-gnu/ruby/gems/2.7.0:/usr/share/rubygems-integration/2.7.0:/usr/share/rubygems-integration/all:/usr/lib/x86_64-linux-gnu/rubygems-integration/2.7.0', 
execute `gem env` for more information
 from /usr/lib/ruby/2.7.0/rubygems/specification.rb:1402:in `block in 
activate_dependencies'
 from /usr/lib/ruby/2.7.0/rubygems/specification.rb:1391:in `each'
 from /usr/lib/ruby/2.7.0/rubygems/specification.rb:1391:in 
`activate_dependencies'
 from /usr/lib/ruby/2.7.0/rubygems/specification.rb:1373:in `activate'
 from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_gem.rb:68:in `block 
in gem'
 from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_gem.rb:68:in 
`synchronize'
 from /usr/lib/ruby/2.7.0/rubygems/core_ext/kernel_gem.rb:68:in `gem'

Full log 
https://people.debian.org/~praveen/ruby-kramdown2-meta-build/buildlogs/jekyll.log

Seems not many breaking changes and relaxing dependency may be enough 
(major one is required minimum version of ruby is 2.3) 
https://github.com/gettalong/kramdown/blob/master/doc/news/release_2_0_0.page

This version include a fix for CVE so getting this to unstable soon 
would be nice.