fill changelog and remove old MainButton.onClick

tgbotapi.webapps/src/jsMain/kotlin/dev/inmo/tgbotapi/webapps/MainButton.kt

@@ -39,12 +39,6 @@ data class MainButtonParams(
     val isVisible: Boolean? = null
 )
 
-@Deprecated(message = "Use onClick without EventHandler")
-fun MainButton.onClick(eventHandler: EventHandler) = onClick {
-    val that = js("this").unsafeCast<WebApp>()
-    that.eventHandler()
-}
-
 fun MainButton.setParams(params: MainButtonParams) = setParams(
     json(
         *listOfNotNull(