Add missing parameters to readme

README.md

@@ -20,6 +20,10 @@ Parameters:
 	-betapassword <pass>	- branch password if applicable.
 	-all-platforms			- downloads all platform-specific depots when -app is used.
 	-os <os>				- the operating system for which to download the game (windows, macos or linux, default: OS the program is currently running on)
+	-osarch <arch>			- the architecture for which to download the game (32 or 64, default: the host's architecture)
+	-all-languages			- download all language-specific depots when -app is used.
+	-language <lang>		- the language for which to download the game (default: english)
+	-lowviolence			- download low violence depots when -app is used.
 
 	-pubfile <#>			- the PublishedFileId to download. (Will automatically resolve to UGC id)