Fix typo in docs

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Update shell docs

Not everybody uses Zsh.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Add missing release date to history section

Signed-off-by: Wincent Colaiuta <win@wincent.com>