Remove History section on README
Remove History section on README

This section **should** be on the main Xtensis repo README instead, as
it is better suited there to give an overview on the history of Xtensis.

Acked-by: Dom Rodriguez <877a6a6dba761704a720c755f2931c31cb0cc923@shymega.org.uk>
Reviewed-by: Dom Rodriguez <877a6a6dba761704a720c755f2931c31cb0cc923@shymega.org.uk>
Signed-off-by: Dom Rodriguez <877a6a6dba761704a720c755f2931c31cb0cc923@shymega.org.uk>

shymega/slacs,shymega/slacs