Log Message:
databases/ruby-mysql2: update to 0.5.0

0.5.0						2018/3/21

Breaking Changes

* Ruby 2.0 or higher required. Ruby 1.8.7 and Ruby 1.9.3 are not supported.
* MySQL 5.5 or higher required. MySQL 5.0 and 5.1 are not supported.

New Features

* Expose mysql_set_server_option to turn multiple statements on and off (#943)
* Accept query options on Statement#execute (#912)
* Support connect attributes and the program_name attribute (#760)
* Make server_status variable available (#755)

Bug Fixes

* Fix wrong value of type YEAR on big endian environment (#921)
* MySQL 8.0.3 Release Candidate removes MYSQL_SECURE_AUTH (#891)
* Suppress Fixnum and Bignum warnings on Ruby 2.4 (#907)

Changes

* Resolve warnings for my_bool vs. bool types (#916, #919)
* Call BigDecimal(num) instead of BigDecimal.new(num) (#925, #928)
* GitHub is HTTPS by default (#922)
* Misc Cleanups (#918)
* More specific exception classes (#260, #404, #870, 911)
* Update RuboCop to 0.50.x (#752)
* Prefix more C functions with rb_mysql_ (#910)
* Fix compat with RubyInstaller-2.4 on Windows (#875)