ZhongShengping bcc7fee775 update min tox version to 2.0
The commands used by constraints need at least tox 2.0.  Update to
reflect reality, which should help with local running of constraints
targets.

Change-Id: I8a427d34e2bd5bcfb5da3ee14c29a5de46995a9a
2018-10-16 11:42:42 +08:00
..
2018-07-18 16:22:01 +02:00
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