Close PDH handles after each query

[dbwiddis]

No description provided.

[codecov-io]

Codecov Report

Merging #769 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #769   +/-   ##
=========================================
  Coverage     82.15%   82.15%           
  Complexity      198      198           
=========================================
  Files            26       26           
  Lines          1491     1491           
  Branches        217      217           
=========================================
  Hits           1225     1225           
  Misses          127      127           
  Partials        139      139

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[coveralls]

Coverage remained the same at 90.275% when pulling a152cec on dbwiddis:pdh-handles into 2f1b100 on oshi:master.