Update net-ldap dependency

Author: dzaporozhets

gitlab_omniauth-ldap.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |gem|
   gem.homepage      = "https://github.com/gitlabhq/omniauth-ldap"
 
   gem.add_runtime_dependency     'omniauth', '~> 1.0'
-  gem.add_runtime_dependency     'net-ldap', '~> 0.2.2'
+  gem.add_runtime_dependency     'net-ldap', '~> 0.3.1'
   gem.add_runtime_dependency     'pyu-ruby-sasl', '~> 0.0.3.1'
   gem.add_runtime_dependency     'rubyntlm', '~> 0.1.1'