Update README.md

[ahsandar]

fix file name in example

Summary: fix file extension in example

The checklist before PR is ready for review:

• [X ] README updated if need

[codecov]

Codecov Report

Merging #619 (1cc2c58) into master (bdece85) will decrease coverage by 0.69%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #619      +/-   ##
==========================================
- Coverage   22.19%   21.50%   -0.70%     
==========================================
  Files          55       55              
  Lines        1739     1739              
==========================================
- Hits          386      374      -12     
- Misses       1272     1289      +17     
+ Partials       81       76       -5     

Impacted Files	Coverage Δ
container_runtimes/docker/sdk/docker.go	33.88% <0.00%> (-9.92%)	⬇️

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[metrue]

Thanks for your contribution.