Update dependencies.

Author: atimin

rmodbus.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
 
   gem.add_development_dependency 'rake','~>10.4'
   gem.add_development_dependency 'bundler', '~>1.7'
-  gem.add_development_dependency 'rspec', '~>2.9'
+  gem.add_development_dependency 'rspec', '~>2.99'
   gem.add_development_dependency 'guard-rspec', '~>1.2'
   gem.add_development_dependency 'pry', '~>0.10'