Lucahan/add auto approve

[lucashan]

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

Merging #73 (5944c4f) into master (3bb761b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #73   +/-   ##
=======================================
  Coverage   89.60%   89.60%           
=======================================
  Files          18       18           
  Lines         885      885           
=======================================
  Hits          793      793           
  Misses         92       92           

Flag	Coverage Δ
ROS_1	89.60% <ø> (ø)
ROS_2	91.76% <ø> (ø)
dashing	91.76% <ø> (ø)
kinetic	89.69% <ø> (ø)
melodic	91.76% <ø> (ø)

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