override toString() method in Username for fix duplicating

[Slenkis]

Problem: duplicating username field in

it.chat.userOrNull()?.username?.username ?: "null username"

After fix:

it.chat.userOrNull()?.username ?: "null username"

Where:

dev.inmo.tgbotapi.types.ChatIdentifier.kt ==>> data class Username

Fix:

@Serializable(ChatIdentifierSerializer::class)
data class Username(
   private val username: String
) : ChatIdentifier {
    override fun toString(): String = this.username

    val usernameWithoutAt
        get() = username.dropWhile { it == '@' }

    init {
        if (!username.startsWith("@")) {
            throw IllegalArgumentException("Username must starts with `@`")
        }
    }
}

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