GpasteHistory: fix max memory logic

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
update NEWS

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
Merge branch '3.0'

* 3.0:
  update NEWS
  GpasteHistory: fix max memory logic
update NEWS

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>