stm32f303xe missing ADC3 Channel 3

[tgbl-mk]

I'm not sure if this repository is being actively maintained, but I guess this is worth raising anyway.

I am convering an application from C to rust and have hit a road block as PE13 has not been listed as an avialable channel for ADC3 in stm32f303xd/stm32f303xe devices. Digging in the source code for this repo I think this could be a simple 1 line fix in src/adc/channels.rs to the macro called at line 268.

Snippet from the datasheet confirms that PE13 can be used an ADC channel for ADC3