Added the method giftPremiumSubscription, allowing bots to gift a user a Telegram Premium subscription paid in Telegram Stars.

Author: mircoianese

library/src/main/java/com/pengrad/telegrambot/request/GiftTelegramSubscription.kt

@@ -0,0 +1,41 @@
+package com.pengrad.telegrambot.request
+
+import com.pengrad.telegrambot.model.MessageEntity
+import com.pengrad.telegrambot.request.business.TransferGift
+import com.pengrad.telegrambot.response.BaseResponse
+import com.pengrad.telegrambot.utility.kotlin.optionalRequestParameter
+import com.pengrad.telegrambot.utility.kotlin.requestParameter
+
+@Suppress("unused")
+class GiftTelegramSubscription private constructor(
+    userId: Long,
+    monthCount: Int,
+    starCount: Int,
+    text: String?,
+    textParseMode: String?,
+    textEntities: Array<MessageEntity>?
+): KBaseRequest<GiftTelegramSubscription, BaseResponse>(BaseResponse::class) {
+
+    constructor(userId: Long, monthCount: Int, starCount: Int) : this(
+        userId = userId,
+        monthCount = monthCount,
+        starCount = starCount,
+        text = null,
+        textParseMode = null,
+        textEntities = null
+    )
+
+    val userId: Long by requestParameter(userId, customParameterName = "user_id")
+    val monthCount: Int by requestParameter(monthCount, customParameterName = "month_count")
+    val starCount: Int by requestParameter(starCount, customParameterName = "star_count")
+
+    var text: String? by optionalRequestParameter(text, customParameterName = "text")
+    fun text(text: String) = applySelf { this.text = text }
+
+    var textParseMode: String? by optionalRequestParameter(textParseMode, customParameterName = "text_parse_mode")
+    fun textParseMode(textParseMode: String) = applySelf { this.textParseMode = textParseMode }
+
+    var textEntities: Array<MessageEntity>? by optionalRequestParameter(textEntities, customParameterName = "text_entities")
+    fun textEntities(textEntities: Array<MessageEntity>) = applySelf { this.textEntities = textEntities }
+
+}