Temporarily exclude webmock 3.24.0 due to a regression.

* bblimke/webmock#1082

Author: postmodern

Gemfile

@@ -18,7 +18,7 @@ group :development do
   gem 'rake'
   gem 'rubygems-tasks',     '~> 0.1'
   gem 'rspec',              '~> 3.0'
-  gem 'webmock',            '~> 3.0'
+  gem 'webmock',            '~> 3.0', '!= 3.24.0'
   gem 'simplecov',          '~> 0.18'
 
   gem 'kramdown',           '~> 2.0'