version 0.9.1

@AmoebeLabs
Not really an issue: I've modified the code with the follows:

* release : 0.9.1 (candidate)
* by : Fabio Salvicchi
* date : 17 March 2021
* log : - no uppercase translation for card's name, is up to you choose the case
* - added a new horseshoe_style named 'colorstoplineargradient'; it display a gradient
* from the first color_stop to the value's corrispondent color_stop

Is there a way to send you the code for your approbation?

Thank you for your great job!