Release/v0.6.0

[thejpster]

• Keyboard::new is now const
• Layout and Scan Code Set are now const-generics, not arguments
• Pause/Break and Print Screen now work correctly
• KeyCode is now non-exhaustive
• KeyState includes 'SingleShot' for keys with no break code
• Add Colemak, Dvorak Programmer and DE layouts
• MSRV increased to Rust 1.61

[jonathanpallant]

Did we actually remember to publish this? Repo needs tagging too.

[eldruin]

Oops, sorry it seems I forgot to publish it. I have pushed the tag now as well.