Fix Typo in Readme.md

[kalpitmalviya]

What this PR does / why we need it:

Which issue(s) this PR fixes:
I Fixed Typo in Readme.md, @SachinVarghese, please review it.

Fixes #
#4228
Special notes for your reviewer:

[seldondev]

Hi @kalpitmalviya. Thanks for your PR.

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[kalpitmalviya]

/assign @SachinVarghese

[SachinVarghese]

Thanks for the contribution @kalpitmalviya , LGTM

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SachinVarghese

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