Update pytest from 3.4.1 to 3.4.2 (#3304)
Update pytest from 3.4.1 to 3.4.2 (#3304)


KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,edmorley/treeherder