Fix dependency vulnerability

Author: tmilewski

omniauth-ldap.gemspec

@@ -10,14 +10,12 @@ Gem::Specification.new do |gem|
   gem.license       = "MIT"
 
   gem.add_runtime_dependency     'omniauth', '~> 1.0'
-  gem.add_runtime_dependency     'net-ldap', '~> 0.12'
+  gem.add_runtime_dependency     'net-ldap', '~> 0.16'
   gem.add_runtime_dependency     'pyu-ruby-sasl', '~> 0.0.3.2'#0.0.3.1 has been yanked
   gem.add_runtime_dependency     'rubyntlm', '~> 0.3.4'
   gem.add_development_dependency 'rspec', '~> 2.7'
   gem.add_development_dependency 'simplecov'
   gem.add_development_dependency 'rack-test'
-  gem.add_development_dependency 'libnotify'
-  gem.add_development_dependency 'ruby-debug19'
 
   gem.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   gem.files         = `git ls-files`.split("\n")