Fix krew yaml && typo

[astraw99]

To make it consistent with the krew-index: https://github.com/kubernetes-sigs/krew-index/blob/master/plugins/kc.yaml

[codecov]

Codecov Report

Merging #509 (a715f96) into master (7005ea5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #509   +/-   ##
=======================================
  Coverage   11.53%   11.53%           
=======================================
  Files          19       19           
  Lines        1846     1846           
=======================================
  Hits          213      213           
  Misses       1616     1616           
  Partials       17       17           

Flag	Coverage Δ
unittests	11.53% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[sunny0826]

LGTM