Added deleteMessage support

[savefolla]

No description provided.

[Ayve1]

There is different variable name in chatId and chat_id.
Should be:
chat_id: chat_id
in line 608

[rotimi-best]

I have been expecting this feature for a while now. I hope it is committed to the master branch as I need it in one of my projects.

[rotimi-best]

/**
 *
 * @param {number|string} chat_id //change from chatId to chat_id
 * @param {number} message_id
 * @returns {Promise<boolean>}
 */
 deleteMessage(chat_id, message_id) {
    const params = { chat_id, message_id }; // Simplify this line since the arguments are the similar to the params keys

    return this.call('deleteMessage', Object.assign(params));
 }