Bump kotlin to 1.4.0-rc-284

Author: erokhins

gradle.properties

@@ -2,10 +2,10 @@
 # Copyright 2016-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 #
 
-version=0.14.3-SNAPSHOT
+version=0.14.4-1.4.0-rc-284
 group=org.jetbrains.kotlinx
 
-kotlin_version=1.3.71
+kotlin_version=1.4.0-rc-284
 asm_version=7.2
 slf4j_version=1.8.0-alpha2
 junit_version=4.12