tree babf4481cf5919bed99721862bdfe076670ad826
parent 875c77df68f9917ded1c0234c7db6dd02a5f0e15
author Riccardo Pittau <elfosardo@gmail.com> 1594820593 +0200
committer Riccardo Pittau <elfosardo@gmail.com> 1594820593 +0200

Set min version of tox to 3.2.1

As recommended, since version 3.2.0 tox switches pip invocations
to use the module -m pip instead of direct invocation.
We set min version to 3.2.1 [1] to also fix the behavior of
--parallel--safe-build

[1] https://tox.readthedocs.io/en/latest/changelog.html#v3-2-1-2018-08-10

Change-Id: I7a791c8239ae54b74e714145a69e9af00c96bc6f