Edit README.md

Author: inunix3

README.md

@@ -80,7 +80,8 @@ I'd appreciate it.
 
 Used font is **The PC Paint Font Collection** made by [codeman38](https://www.zone38.net/font/).
 
-Graphics were made in Aseprite and Gimp, sound effects in MilkyTracker and Audacity.
+Graphics were made in [Aseprite](https://www.aseprite.org/) and [Gimp](https://www.gimp.org/),
+sound effects in [MilkyTracker](https://milkytracker.org/) and [Audacity](https://www.audacityteam.org/).
 
 ## License