Add support for the new iPad models

[jordyvandorp]

Currently the tool doesn't support the new iPad models. the models missing are the iPad 8th generation (wifi and cellular) and the iPad Air 4th gen (wifi and cellular)

Both use the A14 chipset

[airsquared]

These devices will be added in the next version, but until then are you able to manually specify the identifier of those devices?

[airsquared]

Please try the beta in #242.

[airsquared]

Added in v3.0.