fix(toast): add toast back to the components export

ionic/components.ts

@@ -45,6 +45,7 @@ export * from './components/spinner/spinner';
 export * from './components/tabs/tabs';
 export * from './components/tabs/tab';
 export * from './components/tap-click/tap-click';
+export * from './components/toast/toast';
 export * from './components/toggle/toggle';
 export * from './components/toolbar/toolbar';
 export * from './components/virtual-scroll/virtual-scroll';