docs: bump version to 1.7.4, update changelog

index.php

@@ -1,6 +1,6 @@
 <?php
 // MainTiddlyServer
-$version = '1.7.3';
+$version = '1.7.4';
 // MIT-licensed (see https://yakovl.github.io/MainTiddlyServer/license.html)
 $debug_mode = false;
 
@@ -116,6 +116,8 @@
 	
 	(forked from MTS v2.8.1.0, see https://groups.google.com/forum/#!topic/tiddlywiki/25LbvckJ3S8)
 	changes from the original version:
+	1.7.4
+	+ added support of TW 2.10.0 (not using new interfaces yet)
 	+ support .htm, .hta files (treat the same as .html)
 	1.7.3
 	+ fixed backstage save button