Upgrade py-cpuinfo to 3.2.0

[fabaff]

3.2.0

• Broken Qemu guest CPU flag parsing on Ubuntu 17.04 POWER8

3.1.0

• Include py-cpuinfo version in output
• Missing AVX2 CPU flag on OS X
• Broken on Odroid XU3 armhf ARM 32bit
• Not working on RHEL7.3 ppc64le
• Not working on Red Flag Linux ppc64le
• Not working on Fedora 24 ppc64le

Tested with the following configuration:

sensor:
  - platform: cpuspeed
    name: CPU

[mention-bot]

@fabaff, thanks for your PR! By analyzing the history of the files in this pull request, we identified @JshWright, @balloob and @rmkraus to be potential reviewers.