update readme

README.md

@@ -2,7 +2,7 @@
 
 This plugin adds social media buttons to your web site (to the footer of each page, the article page or the sidebar) without compromising the privacy of website users. It implements shariff by heise ([Github](https://github.com/heiseonline/shariff), [article](http://ct.de/shariff)) in [Open Journal Systems](https://pkp.sfu.ca/ojs/).
 
-This plugin has been tested with OJS version 3.2.1!
+This plugin has been tested with OJS version 3.3.0! It should also be compatible with OMP 3.3 and OPS 3.3.
 
 ## Features
 
@@ -48,7 +48,7 @@ This plugin is licensed under the GNU General Public License v3. See the file LI
 
 ## System Requirements
 
-This plugin is compatible with OJS version 3.2.1.
+This plugin is compatible with OJS version 3.3.0. It should also be compatible with OMP 3.3 and OPS 3.3.
 
 ## Installation
 
@@ -81,6 +81,8 @@ Contact us via [email protected]. Find out more about the project [OJS-de.net](
 
 ## Version History
 
+* 3.3 - plugin version for OJS 3.3
+* 3.2 - plugin version for OJS 3.2
 * 3.0 - Adaption to OJS/OMP 3.1.2, update to Shariff Version 3.2.1
 * 2.0 - Adaption to OJS/OMP 3
 * 1.0 - Shariff plugin for OJS 2
@@ -95,6 +97,7 @@ The buttons are added via template hooks:
 * Templates::Common::Footer::PageFooter
 * Templates::Article::Details 
 * Templates::Catalog::Book::Details
+* Templates::Preprint::Details
 
 To add the plugin to the sidebar, this plugin is also a [block plugin](https://github.com/ojsde/shariff/blob/master/ShariffBlockPlugin.inc.php).