bot,api: fix stop channel race #641
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Problem
Running tests with race flag, you may get these errors:
Previous read at 0x00c0015a6628 by goroutine 106:
https://github.com/tucnak/telebot/blob/v3/api.go#L39
Write at 0x00c0015a6628 by main goroutine:
https://github.com/tucnak/telebot/blob/v3/bot.go#L205
Solution
Use a mutex to manage stopClient channel.
Note: Kinda a duplicate of #625, however it ensures that multiple stops or starts doesn't cause race issues.