Generalise `isWindows7` detection to all OSes that end with "/ Version"
Add `like Chrome X` data for Chromium-based Opera browsers
Add support for Opera Mini 8 on iOS

Closes #60.
Fix tests for Opera Mini 8 on iOS

Ref. #60
Add `cleanupOS` utility function
Detect Breach browser

Closes #61
Add `like Chrome X` data for Breach

Ref. #61
Update tested version of Chrome in readme. [ci skip]