updated the postcheck section

[8101708638]

What this PR does / why we need it:

there is a postcheck section required in the README.md Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

Release note:

[codecov[bot]]

Codecov Report

Merging #845 (cca25d1) into master (d3759cc) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #845      +/-   ##
==========================================
- Coverage   70.60%   70.58%   -0.02%     
==========================================
  Files         180      180              
  Lines       18825    18825              
  Branches     2769     2769              
==========================================
- Hits        13291    13288       -3     
- Misses       4693     4694       +1     
- Partials      841      843       +2     

Impacted Files	Coverage Δ
delfin/drivers/fake_storage/__init__.py	94.40% <0.00%> (-0.77%)	:arrow_down:

[skdwriting]

Please link the issue corresponding to this fix. If no issues you can raise one and give the issue number in this PR. If the issue os raised as a part of sodacode2022, please add #SODACODE2022 in the issue description