readme: make screenshot visible in readme

README.md

@@ -42,9 +42,9 @@ If you are experienced with reversing, help is needed to document and decompile
 # Modding
 Here are some screenshots of a few things I tinkered around with, to demonstrate what can be achieved.
 
-Screenshot 1: Monster life https://postimg.cc/image/xgmizy2h9/
+![Screenshot 1: Monster life](https://s22.postimg.cc/rfou2vfv5/diabdung.png "Monster life")
 
-Screenshot 2: New trade screen https://postimg.cc/image/nw2wd2kv1/
+![Screenshot 2: New trade screen](https://s22.postimg.cc/z8fhuutk1/diabstore.png "New trade screen")
 
 # Credits
 - [sanctuary](https://github.com/sanctuary) - documenting the Windows-specific Diablo code (engine, mpq, directx)