Option to skip update-check

[alexgit2k]

Every time deployer is started it checks if there is an update available (except for execution plans):

https://github.com/deployphp/deployer/blob/507f54c26f95877812c90cc06208c9f22105dd0a/src/Command/MainCommand.php#L163-L170

I would like to have an option like --skip-updatecheck to skip the update-check.

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