devel/ruby-mocha: update to 1.8.0
## 1.8.0
* Constrain rubocop version to avoid breaking Travis CI builds (05e507f5)
* Avoid calling Kernel#format from ObjectMethods#mocha_inspect - thanks to @hoffmanilya (#345)
* Fix build matrix script (#346)
* Avoid deprecation warning in gemspec (4976e0bc)
* Removed link to documentation translation (ef428ea2)
* Don't use the new bundler v2 in builds (683ded9b)
* Moved documentation from https://gofreerange.com/mocha/docs to https://mocha.jamesmead.org/ [683ded...a17fde](https://github.com/freerange/mocha/compare/683ded...a17fde)
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