Updated kotlinx.serialization version.

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

Author: MairwunNx

gradle.properties

@@ -10,7 +10,7 @@ brigadierBaseVersion=1.0.17
 mappingsChannelType=snapshot
 mappingsChannelVersion=20190719-1.14.3
 kotlinJdkVersionTarget=jdk8
-kotlinxSerializationVersion=0.12.0
+kotlinxSerializationVersion=0.14.0
 kotlinVersion=1.3.61
 projectEssentialsVersion=1.14.4-0.1.0.0
 projectEssentialsName=Project Essentials Chat