Tighten minitar version range in r10k.gemspec

Co-authored-by: Tim Meusel <tim@bastelfreak.de>

r10k.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'puppet_forge', '>= 4.1.0'
   s.add_dependency 'gettext-setup', '>=0.24', '<2.0'
   s.add_dependency 'jwt', '>= 2.2.3', '< 3'
-  s.add_dependency 'minitar', '>= 0.9'
+  s.add_dependency 'minitar', '>= 0.9', '< 2'
 
   s.add_development_dependency 'rspec', '~> 3.1'
   s.add_development_dependency 'rake'