chore: update webmock

Author: bethesque

pact-mock_service.gemspec

@@ -32,7 +32,7 @@ Gem::Specification.new do |gem|
 
   gem.add_development_dependency 'rack-test', '~> 0.7'
   gem.add_development_dependency 'rake', '~> 10.0.3'
-  gem.add_development_dependency 'webmock', '~> 1.18.0'
+  gem.add_development_dependency 'webmock', '~> 3.4'
   gem.add_development_dependency 'pry'
   gem.add_development_dependency 'fakefs', '~> 0.4'
   gem.add_development_dependency 'hashie', '~> 2.0'