How to Display lowercase text in NativeBase Button

When I add a Text element in a Button according to the examples, the text shows up in uppercase. I need to display a button with lowercase text. I'm using native-base version 2.1.4. Any help with this will be most appreciated. As an example, if I include the code below, the button would say SUBMIT instead of Submit:

import { Button} from 'native-base';
<Button>
  <Text>Submit</Text>
</Button>