Update compose view, add deprecation notice for v3

resources/views/status/compose.blade.php

@@ -5,6 +5,11 @@
 <div class="compose-container container mt-5 d-none">
 	<div class="row">
 		<div class="col-12 col-md-6 offset-md-3">
+			<div class="alert alert-info text-center">
+				<span class="font-weight-bold">ComposeUI v3 is deprecated</span>
+				<br>
+				It will be removed after June 1st, 2020
+			</div>
 			<p class="lead text-center">
 				<a href="javascript:void(0)" class="btn btn-primary font-weight-bold" data-toggle="modal" data-target="#composeModal">Compose New Post</a>
 			</p>