Update atomicwrites from 1.2.1 to 1.3.0 (#4543)
Update atomicwrites from 1.2.1 to 1.3.0 (#4543)


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