Devices recognised as multiple types (e.g. tablet and mobile)

[BorePlusPlus]

I came across a fair few cases where a device returns true on multiple of is_mobile, is_tablet, and is_pc. I believe this to be a bug (but am open to hearing in which cases it isn't). A most common example I've seen is iPad using a Mobile Chrome getting marked as both mobile and tablet.

[kimihito]

Could you please publish #108 on pypi that addresses this issue?