Kube version helm

[bwagner5]

Issue #, if available:
N/A

Description of changes:

• Change helm helper kube-version retrieval to use Major/Minor instead of Version since it's supported in helm v2 and v3
• Add helm v2 and v3 linting to travis

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

[codecov-commenter]

Codecov Report

Merging #190 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #190   +/-   ##
=======================================
  Coverage   81.26%   81.26%           
=======================================
  Files          10       10           
  Lines         774      774           
=======================================
  Hits          629      629           
  Misses        129      129           
  Partials       16       16           

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[cjerad]

Nice work