[PATCH 4/7] docs: Add an upgrading guide

[Finucane, Stephen]

On 03 Feb 21:22, Stephen Finucane wrote:
> The guide details the general pitfalls such users may encounter when
> upgrading a patchwork. Upgrading older deployments of patchwork,
> particularly those that are pre-1.0, can be a daunting task and this
> guide should support users in this task. However, it should not
> replace the UPGRADING document but rather supplement it with more
> general, non-version specific advice.
> 
> Signed-off-by: Stephen Finucane <stephen.finucane at intel.com>

Merged.