Milestones Renamed

[Max Kanat-Alexander]

	Today I renamed the Bugzilla 4.0 milestone on bugzilla.mozilla.org to
Bugzilla 5.0, and the Bugzilla 3.8 milestone to Bugzilla 4.0. I also
added a Bugzilla 4.2 milestone.

	If a bug is desired for the next-ish release but doesn't have an
assignee, it should be assigned to "Bugzilla 5.0". Later, if there is
actually somebody working on the bug, they can then set the milestone
more appropriately (like, to Bugzilla 4.2).

	-Max
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