updated contributors list

README.MD

@@ -52,7 +52,8 @@ Please follow these steps if you find an unknown issue:
 - Please report the issue with a short description describing how to reproduce the issue, Browser version, OS name and version here: https://github.com/gildas-lormeau/SingleFile/issues.
 
 ## Contributors
--  Japanese translation done by Shitennouji （四天王寺)
+- Japanese translation done by Shitennouji （四天王寺)
+- Polish translation done by xesarni (https://github.com/xesarni)
 
 Suggestions are welcome :)
 

extension/ui/pages/help.html

@@ -409,6 +409,7 @@
 				<a id="contributors">Contributors</a>
 				<ul>
 					<li>Japanese translation, done by Shitennouji （四天王寺)</li>
+					<li>Polish translation done by xesarni (<a href="https://github.com/xesarni">Github profile</a>)</li>
 				</ul>
 			</li>