Forge mappings for 1.15.2 updated.

Signed-off-by: Pavel Erokhin (MairwunNx) <MairwunNx@gmail.com>

Author: MairwunNx

gradle.properties

@@ -4,7 +4,7 @@ org.gradle.daemon=false
 org.gradle.caching=true
 # Forge mappings channel type and version.
 forge_mappings_channel_type=snapshot
-forge_mappings_channel_version=20190719-1.14.3
+forge_mappings_channel_version=20200514-1.15.1
 # Forge dependencies.
 forge_version=1.14.4-31.2.0
 # Project compatibility settings.