Bump version to 0.4.0

Author: JohnAZoidberg

src/me/danielschaefer/sensorwrangler/Settings.kt

@@ -16,7 +16,7 @@ import kotlin.reflect.KClass
 open class Settings {
     val chartUpdatePeriod: Double = 40.0
     val timeFormat = DateTimeFormatter.ofPattern("HH:mm:ss")
-    val version = "0.3.0"
+    val version = "0.4.0"
 
     val supportedSensors: MutableList<KClass<out Sensor>> = mutableListOf(
         AntCadenceSensor::class,