Fix typo in README

[kabouzeid]

No description provided.

[CLAassistant]

All committers have signed the CLA.

[OpenMMLab-Assistant-004]

Hi @kabouzeid,

We'd like to express our appreciation for your valuable contributions to the mmdetection3d. Your efforts have significantly aided in enhancing the project's quality.
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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6299a1f) 46.92% compared to head (6142c30) 46.92%.

❗ Current head 6142c30 differs from pull request most recent head 1897581. Consider uploading reports for the commit 1897581 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #2546   +/-   ##
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  Coverage    46.92%   46.92%           
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  Files          277      277           
  Lines        23235    23235           
  Branches      3622     3622           
========================================
  Hits         10903    10903           
  Misses       11641    11641           
  Partials       691      691           

Flag	Coverage Δ
unittests	46.92% <ø> (ø)

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