Added the method transferGift, allowing bots to transfer unique gifts owned by a managed business account.

Author: mircoianese

library/src/main/java/com/pengrad/telegrambot/request/business/TransferGift.kt

@@ -0,0 +1,30 @@
+package com.pengrad.telegrambot.request.business
+
+import com.pengrad.telegrambot.request.KBaseRequest
+import com.pengrad.telegrambot.response.BaseResponse
+import com.pengrad.telegrambot.utility.kotlin.optionalRequestParameter
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+@Suppress("unused")
+class TransferGift private constructor(
+    businessConnectionId: String,
+    ownedGiftId: String,
+    newOwnerChatId: Long,
+    starCount: Int?
+): KBaseRequest<TransferGift, BaseResponse>(BaseResponse::class) {
+
+    constructor(businessConnectionId: String, ownedGiftId: String, newOwnerChatId: Long) : this(
+        businessConnectionId = businessConnectionId,
+        ownedGiftId = ownedGiftId,
+        newOwnerChatId = newOwnerChatId,
+        starCount = null
+    )
+
+    val businessConnectionId: String by requestParameter(businessConnectionId, customParameterName = "business_connection_id")
+    val ownedGiftId: String by requestParameter(ownedGiftId, customParameterName = "owned_gift_id")
+    val newOwnerChatId: Long by requestParameter(newOwnerChatId, customParameterName = "new_owner_chat_id")
+
+    var starCount: Int? by optionalRequestParameter(starCount, customParameterName = "star_count")
+    fun starCount(starCount: Int) = applySelf { this.starCount = starCount }
+
+}