Update webhook route - added bot username param

[tanhongit]

Currently, the route used to set webhooks allows receiving events from github and gitlab:

laravel-telegram-git-notifier/routes/bot.php

Line 21 in 6618e27

Route::match(['get', 'post'], '/', IndexAction::class)->name("$routePrefix.index");

I need to pass the bot's username to distinguish each individual bot in the upcoming multiple bot feature.

Example: {bot_username} or {username}

And handle the logic to differentiate for each bot.