Fix missing parenthesis

[dgageot]

$ skaffold --help
...
Flags:
  -v, --verbosity string   Log level (debug, info, warn, error, fatal, panic (default "warning")
...

Add a parenthesis at the end

Signed-off-by: David Gageot [email protected]

[codecov-io]

Codecov Report

Merging #1089 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #1089   +/-   ##
=======================================
  Coverage   42.43%   42.43%           
=======================================
  Files          72       72           
  Lines        3280     3280           
=======================================
  Hits         1392     1392           
  Misses       1754     1754           
  Partials      134      134

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/cmd.go	0% <0%> (ø)	⬆️

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[balopat]

lgtm