Fix badge icon

[hetong007]

Description

Fix broken badge icon in readme file.

Checklist

Essentials

• Changes are complete (i.e. I finished coding on this PR)

Reference: dmlc/gluon-cv#837

[codecov]

Codecov Report

❗ No coverage uploaded for pull request head (fix_ci_badge@01d09e8). Click here to learn what that means.
The diff coverage is n/a.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@95db4bb). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #800   +/-   ##
=========================================
  Coverage          ?   90.12%           
=========================================
  Files             ?       66           
  Lines             ?     6378           
  Branches          ?        0           
=========================================
  Hits              ?     5748           
  Misses            ?      630           
  Partials          ?        0

[mli]

Job PR-800/1 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-800/1/index.html

[mli]

Job PR-800/2 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-800/2/index.html

[leezu]

Do you know why http://ci.mxnet.io/buildStatus/icon?job=gluon-nlp%2Fmaster says "build not run"?

[hetong007]

@szha do you have better understanding in it?
In principal this badge shows the status for master branch building status, and for gluoncv it works well. Could you make sure that the master branch has been built?

[szha]

@leezu @hetong007 after breaking the single pipeline into multiple pipelines, the job that the icon linked to is no longer used.

[mli]

Job PR-800/3 is complete.
Docs are uploaded to http://gluon-nlp-staging.s3-accelerate.dualstack.amazonaws.com/PR-800/3/index.html

[hetong007]

@szha would you please restart the flaky tests?