Update min required gem dependencies

Author: paulgoetze

code_breaker.gemspec

@@ -27,9 +27,9 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'parser', '~> 2.3'
+  spec.add_dependency 'parser', '~> 2.4'
 
-  spec.add_development_dependency 'bundler', '~> 1.10'
-  spec.add_development_dependency 'rake',    '~> 10.0'
-  spec.add_development_dependency 'rspec',   '~> 3.2'
+  spec.add_development_dependency 'bundler', '~> 1.14'
+  spec.add_development_dependency 'rake',    '~> 12.0'
+  spec.add_development_dependency 'rspec',   '~> 3.6'
 end