Revert "Bump Kover to 0.6.0"

This reverts commit a0a28ba.

Author: PavelPunegov

gradle.properties

@@ -23,7 +23,7 @@ rxjava3_version=3.0.2
 javafx_version=11.0.2
 javafx_plugin_version=0.0.8
 binary_compatibility_validator_version=0.11.0
-kover_version=0.6.0
+kover_version=0.6.0-Beta
 blockhound_version=1.0.2.RELEASE
 jna_version=5.9.0