fix: fix ----label to --label

[HusterWan]

Signed-off-by: HusterWan [email protected]

1.Describe what this PR did

-l, ----label strings      Set label for a container

2.Does this pull request fix one issue?

3.Describe how you did it

4.Describe how to verify it

5.Special notes for reviews

[codecov-io]

Codecov Report

Merging #512 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #512   +/-   ##
=======================================
  Coverage   18.04%   18.04%           
=======================================
  Files          35       35           
  Lines        1790     1790           
=======================================
  Hits          323      323           
  Misses       1432     1432           
  Partials       35       35

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[allencloud]

LGTM, thanks for your correction.