keycap-designer Updated

What's new in v0.1.3:

• The common use scenario has been changed to pip based.
• `DeviceRGBColor` added.

keycap-designer is a Python-based open-source application to design keycap printing images. DecentKeyboards accepts the artifacts as complete printing-ready data.

keycap-designer is good for designing a keycap set. A keycap set should have a consistent design across its keycaps. keycap-designer helps a lot to make a consistent design.

So the learning curve may be too steep if you need just one or two keycaps. In that case, please send me the printing image file, without struggling keycap-designer.