message: Add missing Textarea type definitions
  Bordered and underline were missing from the type definition of Textarea.
diff: @@ -632,6 +632,8 @@ declare module "native-base" {
  */
  interface Textarea extends ReactNative.TextInputProps, Testable {
  rowSpan: number;
  + bordered: boolean;
  + underline: boolean;
  /**
  * Disables inputting data.
  */
  