docs(props): add button text props

Author: marcocesarato

PROPS.md

@@ -74,6 +74,7 @@
 | `step`                  | Value to increment or decrement the current spinner value                                                                      | String<br>Number | `1`              |                                                  |
 | `style`                 | Container style                                                                                                                | Object           |                  | Could overwrite other props                      |
 | `speed`                 | Speed acceleration ratio of increase or decrease `onLongPress`                                                                 | Number           | `7`              | (value from `1` to `10`)                         |
+| `buttonTextProps`       | Customized text button props                                                                                                   | Object           | `null`           |                                                  |
 | `textColor`             | Custom number color                                                                                                            | String           | Auto             |                                                  |
 | `type`                  | Type of spinner                                                                                                                | String           | `int`            | Can be `int` or `real`/`float`...                |
 | `typingTime`            | Time before debounce and trigger `onChange` event                                                                              | Number           | `750`            |                                                  |

README.md

@@ -141,6 +141,7 @@ Check the "[Props List](PROPS.md)" file to have the complete list of component p
 | `step`                 | Value to increment or decrement the current spinner value                                                                      | String<br>Number | `1`     |                                   |
 | `longStep`             | Value to increment or decrement the current spinner value `onLongPress`                                                        | String<br>Number | `step`  |                                   |
 | `speed`                | Speed acceleration ratio of increase or decrease `onLongPress`                                                                 | Number           | `7`     | (value from `1` to `10`)          |
+| `buttonTextProps`      | Customized text button props                                                                                                   | Object           | `null`  |                                   |
 | `typingTime`           | Time before debounce and trigger `onChange` event                                                                              | Number           | `750`   |                                   |
 | `type`                 | Type of spinner                                                                                                                | String           | `int`   | Can be `int` or `real`/`float`... |
 | `value`                | Controlled value of the Spinner                                                                                                | String<br>Number | `0`     |                                   |