Prepare release 0.4.0 (#89)

Author: kevincianfarini

gradle.properties

@@ -2,7 +2,7 @@ kotlin.code.style=official
 
 GROUP=io.github.kevincianfarini.cardiologist
 POM_ARTIFACT_ID=cardiologist
-VERSION_NAME=0.4.0-SNAPSHOT
+VERSION_NAME=0.4.0
 
 POM_NAME=Cardiologist
 POM_DESCRIPTION=Build job schedules with kotlinx-datetime and kotlinx-coroutines.