Add 1.20 to README

Author: embeddedt

README.md

@@ -10,6 +10,7 @@ is directly derived from Sodium and used under the terms of the LGPL-3.0 license
 - 1.18.2, both modloaders: https://nightly.link/embeddedt/ModernFix/workflows/gradle/1.18/Package.zip
 - 1.19.2, both modloaders: https://nightly.link/embeddedt/ModernFix/workflows/gradle/1.19.2/Package.zip
 - 1.19.4, both modloaders: https://nightly.link/embeddedt/ModernFix/workflows/gradle/1.19.4/Package.zip
+- 1.20.1, both modloaders: https://nightly.link/embeddedt/ModernFix/workflows/gradle/1.20/Package.zip
 
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