Updating README.

Author: Macmod

README.md

@@ -158,6 +158,7 @@ For more usage information & examples check the [Wiki](https://github.com/Macmod
 * `--key` - Path to a file containing the private key to use for the bind
 * `--pfx` - Path to a file containing the PKCS#12 certificate to use for the bind
 * `--exportdir` - Custom directory to save godap exports taken with Ctrl+S (defaults to `data`)
+* `--offset` - Custom time offset to apply to formatted timestamps (useful when the DCs are not properly synchronized to UTC)
 
 ## Keybindings