Add '==' to base64 decode for py3

[bcatubig]

Fixes kubernetes-client/python#525

[codecov-io]

Codecov Report

Merging #67 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #67   +/-   ##
=======================================
  Coverage   93.43%   93.43%           
=======================================
  Files          11       11           
  Lines         960      960           
=======================================
  Hits          897      897           
  Misses         63       63

Impacted Files	Coverage Δ
config/kube_config.py	89.69% <ø> (ø)	⬆️

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[hanikesn]

The added padding should really depend on the lenght of the base64 string. See #70.

[bcatubig]

Thanks @hanikesn, will close this