pin mysql2 version to '~> 0.4.10'

- the 0.5.0 version published on March 20, 2018 doesn't work

Author: prettycoder

gemfiles/rails41.gemfile

@@ -18,7 +18,7 @@ else
   gem 'sinatra'
   gem 'pg', '< 0.19'
   gem 'mysql'
-  gem 'mysql2'
+  gem 'mysql2', '~> 0.4.10' # 0.5.0 published March 20, not working (yet)
 end
 
 gem "rails", "~> 4.1.15"

gemfiles/rails42.gemfile

@@ -26,7 +26,7 @@ else
   if RUBY_VERSION < '2.4'
     gem 'mysql'
   end
-  gem 'mysql2'
+  gem 'mysql2', '~> 0.4.10' # 0.5.0 published March 20, not working (yet)
 end
 
 gem "rails", "~> 4.2.5"

gemfiles/rails50.gemfile

@@ -37,7 +37,7 @@ if defined?(JRUBY_VERSION)
   gem 'jdbc-postgresql'
 else
   gem 'pg', '< 1.0.0' # rails is not ready for pg 1.0
-  gem 'mysql2'
+  gem 'mysql2', '~> 0.4.10' # 0.5.0 published March 20, not working (yet)
 end
 
 gemspec :path => File.expand_path(File.dirname(__FILE__) + '/../')

gemfiles/rails51.gemfile

@@ -36,8 +36,8 @@ if defined?(JRUBY_VERSION)
   gem 'activerecord-jdbc-adapter'
   gem 'jdbc-postgresql'
 else
-  gem 'pg', '< 1.0.0' # rails is not ready for pg 1.0
-  gem 'mysql2'
+  gem 'pg' #, '< 1.0.0' # rails is not ready for pg 1.0
+  gem 'mysql2', '~> 0.4.10' # 0.5.0 published March 20, not working (yet)
 end
 
 gemspec :path => File.expand_path(File.dirname(__FILE__) + '/../')