Update credits

Author: mrexodia

README.md

@@ -70,3 +70,4 @@ arguments:
 - https://github.com/mpark/variant
 - https://www.svgrepo.com/svg/192268/hammer
 - https://github.com/can1357 for buying `cmkr.build` ❤️
+- https://github.com/JustasMasiulis for fixing the dark theme ❤️