Remove line that requires MFA for publishing

Author: spencertransier

fastlane-plugin-wpmreleasetoolkit.gemspec

@@ -60,5 +60,4 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop-require_tools', '~> 0.1.2'
   spec.add_development_dependency 'rubocop-rspec', '2.3.0'
   spec.add_development_dependency 'simplecov', '~> 0.16.1'
-  spec.metadata['rubygems_mfa_required'] = 'true'
 end