Simplify .travis.yml file
Simplify .travis.yml file

Remove no-longer-necessary extra commands from
where .travis.yml invokes the verify-mmj2 command.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

metamath/set.mm,metamath/set.mm,metamath/set.mm