Typo fixed in README.md

Change-Id: Iee0288bd30a88c16653d3b47595ab1efe3e913c0
Reviewed-on: https://r.enimai.com/2869
Reviewed-by: Subash Patel <subash@enimai.com>
Tested-by: Subash Patel <subash@enimai.com>