Bump psutil from 5.4.2 to 5.6.6

Bumps [psutil](https://github.com/giampaolo/psutil) from 5.4.2 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-5.4.2...release-5.6.6)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -3,4 +3,4 @@ python-dateutil==2.7
 matplotlib==1.4.3
 numpy==1.14.5
 pymongo>=3.6.1,<4.0.0
-psutil==5.4.2
+psutil==5.6.6

setup.py

@@ -17,8 +17,8 @@
     # simplify the default install experience, particularly where a build
     # toolchain is required.
     extras_requires = {
-        "all": ['matplotlib==1.4.3', 'numpy==1.14.5', 'pymongo>=3.6.1,<4.0.0', 'psutil==5.4.2'],
-        "mlaunch": ['pymongo>=3.6.1,<4.0.0', 'psutil==5.4.2'],
+        "all": ['matplotlib==1.4.3', 'numpy==1.14.5', 'pymongo>=3.6.1,<4.0.0', 'psutil==5.6.6'],
+        "mlaunch": ['pymongo>=3.6.1,<4.0.0', 'psutil==5.6.6'],
         "mlogfilter": [],
         "mloginfo": ['numpy==1.14.5'],
         "mlogvis": [],