update to forge 31.2.21

build.gradle

@@ -16,7 +16,7 @@ group = 'me.hammerle.kcm'
 archivesBaseName = 'kcm'
 
 minecraft {
-    mappings channel: 'snapshot', version: '20190719-1.14.3'
+    mappings channel: 'snapshot', version: '20200514-1.15.1'
 
     runs {
         client {
@@ -34,5 +34,5 @@ minecraft {
 }
 
 dependencies {
-    minecraft 'net.minecraftforge:forge:1.15.2-31.1.0'
+    minecraft 'net.minecraftforge:forge:1.15.2-31.2.21'
 }