README_DEPLOYMENT.md has an incorrect parameter in the site installation instructions

[shawnmasters]

Super minor, unless you are trying to follow those directions. The markdown file suggests using

user@bluetack:~$ takyctl setup --hostname bluetack-1
--public-ip 192.168.1.100
bluetack-1

but "hostname" is not an accepted parameter. Reading through the cli code I found where it is "host" is the one to use, and it is also correct in the instructions above.

Like I said, minor, but if you get a chance to correct it might make someone's day easier.