Fixes for #331 and #332

[jacklul]

Those are fixes I applied to my bots.

Fixes #331
Addresses latest API update causing library to throw exceptions (channel messages), mentioned #332

[noplanman]

@MBoretto have you had a look at this PR too?
@jacklul is this good to merge or more of a quick fix?

[jacklul]

I haven't been able to test it out with new changes because my local getUpdates test bot returns error on dev branch now: PHP Fatal error: Call to a member function getBody() on null in src\Request.php on line 227

But following the logic in new ServerResponse it should be fine...

[MBoretto]

No I didn't look so far. @jacklul we need to align this with the new develop to fix the travis fail

[jacklul]

All should be good now!

[MBoretto]

yessss

[noplanman]

There seems to be another issue with this. Will need to find out the underlying issue here, pin point if-else exceptions aren't so super-duper-awesome...

PHP Fatal error:  Uncaught Error: Call to a member function getFrom() on null in /bot/vendor/longman/telegram-bot/src/Commands/SystemCommands/GenericmessageCommand.php:63
Stack trace:
#0 /bot/vendor/longman/telegram-bot/src/Commands/Command.php(132): Longman\TelegramBot\Commands\SystemCommands\GenericmessageCommand->execute()
#1 /bot/vendor/longman/telegram-bot/src/Telegram.php(465): Longman\TelegramBot\Commands\Command->preExecute()
#2 /bot/vendor/longman/telegram-bot/src/Telegram.php(434): Longman\TelegramBot\Telegram->executeCommand('genericmessage')
#3 /bot/vendor/longman/telegram-bot/src/Telegram.php(362): Longman\TelegramBot\Telegram->processUpdate(Object(Longman\TelegramBot\Entities\Update))
#4 /bot/hook.php(48): Longman\TelegramBot\Telegram->handle()
#5 {main}
  thrown in /bot/vendor/longman/telegram-bot/src/Commands/SystemCommands/GenericmessageCommand.php on line 63

[jacklul]

That's because we don't have ChannelpostCommand.php and EditedchannelpostCommand.php implemented. Channel messages updates don't carry from field, GenericmessageCommand.php uses that field, that's the error here.

I'll PR it!