Error handling

[daemon1024]

Describe the bug

There are lots of edge cases and instances where bot crashes due to some unexpected syntax or error.

Example : Unexpected syntax in /addmeetup

Expected behavior

The bot shouldn't crash instead it should respond with something like " Unexpected behaviour, please try again "

** Additional Context **

We are using log.Fatal / log.Fatalln when an error occurs. This causes the program to call os.exit(1) which is an undesirable behaviour.

Instead we should log.Print the errors as well as a bot response for the same.

[OgmaJ]

@daemon1024 : let me pick this one :

• removing log.Fatal
• convert log.Print & send a error message

[daemon1024]

@OgmaJ sure.

https://github.com/osdc/bots/blob/master/telegram-bot/meetup.go#L139-L141

This may help you out.