fix(discounted-cartrade): modify README.md

[t-yasushi]

This resolve Issue #1181

Signed-off-by: Yasushi Takahashi t-yasushi@fujitsu.com

[codecov-commenter]

Codecov Report

Merging #1276 (cb402d8) into main (034f0df) will not change coverage.
The diff coverage is n/a.

❗ Current head cb402d8 differs from pull request most recent head 5c4696d. Consider uploading reports for the commit 5c4696d to get more accurate results

@@           Coverage Diff           @@
##             main    #1276   +/-   ##
=======================================
  Coverage   71.49%   71.49%           
=======================================
  Files         298      298           
  Lines       10743    10743           
  Branches     1321     1321           
=======================================
  Hits         7681     7681           
  Misses       2364     2364           
  Partials      698      698           

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