Update isort from 4.2.14 to 4.2.15 (#2543)
Update isort from 4.2.14 to 4.2.15 (#2543)


tojon/treeherder,KWierso/treeherder,tojonmz/treeherder,edmorley/treeherder,tojonmz/treeherder,edmorley/treeherder,tojonmz/treeherder,edmorley/treeherder,tojon/treeherder,KWierso/treeherder,edmorley/treeherder,tojonmz/treeherder,KWierso/treeherder,tojon/treeherder,tojon/treeherder,tojonmz/treeherder,tojonmz/treeherder,KWierso/treeherder