docs: remove old badge

[ersachin3112]

This PR contains a:

• [ ] bugfix
• [ ] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [x] metadata update

Motivation / Use-Case

remove old badge

Breaking Changes

No

Additional Info

No

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: -0.14 :warning:

Comparison is base (2ababf9) 21.23% compared to head (f46ebd2) 21.09%.

:exclamation: Current head f46ebd2 differs from pull request most recent head 1857ddc. Consider uploading reports for the commit 1857ddc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
- Coverage   21.23%   21.09%   -0.14%     
==========================================
  Files           8        8              
  Lines         504      493      -11     
  Branches      108       96      -12     
==========================================
- Hits          107      104       -3     
+ Misses        348      340       -8     
  Partials       49       49              

see 4 files with indirect coverage changes

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