1.1.1 stable

This is the first stable release of the 1.1.* version of Mu. The following changes have been made since the last beta:

• Minor clean ups in the Makefile.
• Thank you to @microbit-mark for updating the board IDs to support version 2.2 of the device.
• Updates to the Chinese translation by @CSharperMantle. 謝謝。
• Updates to the Slovak translation by @bletvaska. Ďakujem.
• The foundations of a brand new Russian translation of Mu by @grovz with contributions from @iamdbychkov. спасибо!
• Thanks to @MinoruInachi (with feedback from @odaki) for a revised Japanese translation for Mu. ありがとうございます
• Due to complicated dependency problems, we've updated the bundled version of Flask to 2.0.3. Thanks to @carlosperate for quickly resolving this problem.
• Due to limitations in the way Windows MSI installers work, we're releasing this version as 1.1.1 (rather than 1.1.0).

Many thanks to everyone who has worked so diligently getting to this stable release.