bump yard dep (dev) and remove redcarpet

Author: dchelimsky

.yardopts

@@ -1,6 +1,4 @@
 --markup markdown
---markup-provider redcarpet
---plugin redcarpet-ext
 -
 CHANGELOG.md
 LICENSE

transit-ruby.gemspec

@@ -28,9 +28,7 @@ Gem::Specification.new do |spec|
     spec.files    = files - jruby_files
     spec.add_dependency "oj",                             "~> 2.18"
     spec.add_dependency "msgpack",                        "~> 1.1.0"
-    spec.add_development_dependency "yard",               "~> 0.8.7.4"
-    spec.add_development_dependency "redcarpet",          "~> 3.1.1"
-    spec.add_development_dependency "yard-redcarpet-ext", "~> 0.0.3"
+    spec.add_development_dependency "yard",               "~> 0.9.11"
     private_key_path = File.expand_path(File.join(ENV['HOME'], '.gem', 'transit-ruby', 'private-key.pem'))
     public_key_path  = File.expand_path(File.join(ENV['HOME'], '.gem', 'transit-ruby', 'public-key.pem'))
   end