React-native-calendars: Cannot Easily UpperCase Day and Month Text

[fostertime]

Description

Unable to easily uppercase Day or Month text; without using a custom component for each.

Proposed Solution

Would be fairly simple to add a bool prop for uppercaseDay and uppercaseMonth that simply added .toUpperCase() on those specific text elements.

I could create a pull request if that is something worth adding?

[tautvilas]

I think you can achieve this by providing custom uppercased month names via localization option