Bump psutil from 5.3.0 to 5.6.6

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.3.0 to 5.6.6.
- [Release notes](https://github.com/giampaolo/psutil/releases)
- [Changelog](https://github.com/giampaolo/psutil/blob/master/HISTORY.rst)
- [Commits](giampaolo/psutil@release-5.3.0...release-5.6.6)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
 requests==2.20.0
-psutil==5.3.0
+psutil==5.6.6
 beautifulsoup4==4.6.3