Added double dash to end flag interpretation
This fixes that ACME challenges starting with a hyphen (-) would be interpreted by the hook script as flag.
https://community.letsencrypt.org/t/challenge-file-name-should-not-start-with-dash/3860
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This fixes that ACME challenges starting with a hyphen (-) would be interpreted by the hook script as flag.
https://community.letsencrypt.org/t/challenge-file-name-should-not-start-with-dash/3860