mapping update, fixed missing target mixins

gradle.properties

@@ -5,8 +5,8 @@ org.gradle.jvmargs=-Xmx1G
 	# check these on https://fabricmc.net/use
     # or better: https://modmuss50.me/fabric.html
 	minecraft_version=20w10a
-	yarn_mappings=20w10a+build.10
-	loader_version=0.7.8+build.186
+	yarn_mappings=20w10a+build.20
+	loader_version=0.7.8+build.187
 
 # Mod Properties
 	mod_version = 1.3.14+v200311