add restrictions check in SetChatAdministratorCustomTitle

src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/requests/chat/members/SetChatAdministratorCustomTitle.kt

@@ -1,12 +1,15 @@
 package com.github.insanusmokrassar.TelegramBotAPI.requests.chat.members
 
-import com.github.insanusmokrassar.TelegramBotAPI.CommonAbstracts.types.ChatRequest
-import com.github.insanusmokrassar.TelegramBotAPI.requests.abstracts.SimpleRequest
 import com.github.insanusmokrassar.TelegramBotAPI.requests.chat.abstracts.ChatMemberRequest
 import com.github.insanusmokrassar.TelegramBotAPI.types.*
 import kotlinx.serialization.*
 import kotlinx.serialization.internal.BooleanSerializer
 
+/**
+ * Representation of https://core.telegram.org/bots/api#setchatadministratorcustomtitle
+ *
+ * Please, remember about restrictions for characters in custom title
+ */
 @Serializable
 data class SetChatAdministratorCustomTitle(
     @SerialName(chatIdField)
@@ -21,4 +24,10 @@ data class SetChatAdministratorCustomTitle(
         get() = BooleanSerializer
     override val requestSerializer: SerializationStrategy<*>
         get() = RestrictChatMember.serializer()
+
+    init {
+        if (customTitle.length !in customTitleLength) {
+            throw IllegalArgumentException("Custom title length must be in range $customTitleLength, but was ${customTitle.length}")
+        }
+    }
 }

src/commonMain/kotlin/com/github/insanusmokrassar/TelegramBotAPI/types/Common.kt

@@ -40,6 +40,8 @@ val livePeriodLimit = 60 .. 86400
 
 val inlineQueryAnswerResultsLimit = 0 .. 50
 
+val customTitleLength = 0 .. 16
+
 const val chatIdField = "chat_id"
 const val messageIdField = "message_id"
 const val updateIdField = "update_id"