Log Message:
devel/ruby-power_assert: update to 1.1.1

1.1.1					2017/10/25

* Support :if
* Suppress "shadowing outer local variable" warning
* Support :unless
* Adjust indent
* Add notes for known limitations (#21)
* simplecov should be required at first
* Remove trailing spaces
* Respect tab stops
* support `test-bundled-gems` task on ruby core repository.