Revert Kotlin and atomicfu version

Author: qwwdfsad

gradle.properties

@@ -5,11 +5,11 @@
 # Kotlin
 version=1.3.6-SNAPSHOT
 group=org.jetbrains.kotlinx
-kotlin_version=1.4-M2-eap-72
+kotlin_version=1.3.71
 
 # Dependencies
 junit_version=4.12
-atomicfu_version=0.14.3-mpp-dev-10
+atomicfu_version=0.14.2
 knit_version=0.1.3
 html_version=0.6.8
 lincheck_version=2.7.1