Kotlin version updated to 1.3.70.

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

Author: MairwunNx

gradle.properties

@@ -11,7 +11,7 @@ forge_mappings_channel_version=20190719-1.14.3
 brigadier_version=1.0.17
 kotlin_jdk_version_target=jdk8
 project_jvm_version_target=1.8
-kotlin_version=1.3.61
+kotlin_version=1.3.70
 kotlinx_serialization_version=0.14.0
 kotlinx_coroutines_core_version=1.3.3
 zt_zip_version=1.13