Typo in mruby-bin-debugger/mrbgem.rake

mrbgems/mruby-bin-debugger/mrbgem.rake

 MRuby::Gem::Specification.new('mruby-bin-debugger') do |spec|
   spec.license = 'MIT'
   spec.author  = 'mruby developers'
-  spec.summary = 'mruby debuggeer command'
+  spec.summary = 'mruby debugger command'
 
   spec.add_dependency('mruby-eval', :core => 'mruby-eval')