Add activeTextColor to index.d.ts (#54)

Author: hardworker

index.d.ts

@@ -51,6 +51,12 @@ export interface SegmentedControlIOSProps extends ViewProps {
    */
   textColor?: string;
 
+  /**
+   * (iOS 13 only)
+   * Text color of the active control.
+   */
+  activeTextColor?: string;
+
   /**
    * (iOS 13 only)
    * Background color of the control.