Update README.md

replace shop link

Author: saschaludwig

README.md

@@ -7,9 +7,9 @@ http://saschaludwig.github.io/OnAirScreen/
 <a href='https://ko-fi.com/L3L8BKHYT' target='_blank'><img height='36' style='border:0px;height:36px;' src='https://storage.ko-fi.com/cdn/kofi1.png?v=3' border='0' alt='Buy Me a Coffee at ko-fi.com' /></a>
 
 #### Precompiled Linux/Win/Mac versions
-If you need ready-to-run Linux/Win/Mac executables, please visit https://www.astrastudio.de/software/onairscreen/.
-You can purchase the Windows .exe versions of the latest build including updates.
-If you want to purchase a Linux or Mac binary or need extended support, please contact me.
+If you need ready-to-run Linux/Win/Mac executables, please visit https://www.astrastudio.de/shop/.
+I also have a RaspberryPi version and a ready-to-run RaspberryPi SD-Card image in my shop.
+And if you need extended support, please contact me.
 
 #### Screenshots
 <img src="https://cdn.rawgit.com/saschaludwig/OnAirScreen/gh-pages/images/oas_v2.png" width="600px">