message: Defaulted to bottom toolbar
  Don't want user to pass bottom prop. Toolbar defaults to the BottomAppBar. Only a Toolbar when called internally from the NavigationBar so pass bottom prop false then
diff: import React from 'react';
  import { Platform, Image, StyleSheet, requireNativeComponent } from 'react-native';
  -const Toolbar = ({ bottom, logo, navigationImage, overflowImage, children, style, ...props }: any) => {
  +const Toolbar = ({ bottom = true, logo, navigationImage, overflowImage, children, style, ...props }: any) => {
  var Toolbar = !bottom ? NVToolbar : NVToolbarBottom;
  return (
  <Toolbar
  