Fixed constraint for the ruby 1.9 backend

Author: hurricup

Gemfile

@@ -14,7 +14,7 @@ if RUBY_VERSION < '1.9' || defined?(JRUBY_VERSION)
   gem "ruby-debug-base", :platforms =>  [:jruby, *mries('18')]
 end
 
-if RUBY_VERSION && RUBY_VERSION >= "1.9" && RUBY_VERSION > "2.0"
+if RUBY_VERSION && RUBY_VERSION >= "1.9" && RUBY_VERSION < "2.0"
   gem "ruby-debug-base19x", ">= 0.11.32"
 end