Created Using '--pre-hook', '--post-hook', '--renew-hook' and '--reload-cmd' (markdown)

Using-'--pre-hook',-'--post-hook',-'--renew-hook'-and-'--reload-cmd'.md

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+Those hooks are only work with `--issue` or `--install-cert` command.
+
+```sh
+acme.sh --install-cert -d example.com  --pre-hook "echo this is pre hook"  --post-hook "echo this is post hook." 
+```