Loosen dev dependencies

Author: gekola

pond.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'bundler', '~> 1.3'
-  spec.add_development_dependency 'rspec',   '~> 2.14'
+  spec.add_development_dependency 'bundler', '>= 1.3'
+  spec.add_development_dependency 'rspec',   '>= 2.14'
   spec.add_development_dependency 'rake'
 end