Bump version number to 0.5.2

Author: Bloke

smd_thumbnail.php

@@ -17,7 +17,7 @@
 // 1 = Plugin help is in raw HTML.  Not recommended.
 # $plugin['allow_html_help'] = 1;
 
-$plugin['version'] = '0.5.1';
+$plugin['version'] = '0.5.2';
 $plugin['author'] = 'Stef Dawson';
 $plugin['author_uri'] = 'https://stefdawson.com/';
 $plugin['description'] = 'Multiple image thumbnails of arbitrary dimensions';