Switched to SVG graphs

[tdulcet]

• Updated README to switch to SVG graphs after Switched to SVG graphs findutils-tracking#7

Also see for coreutils: uutils/coreutils#7888

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.69%. Comparing base (f072587) to head (1548034).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #545   +/-   ##
=======================================
  Coverage   87.69%   87.69%           
=======================================
  Files          31       31           
  Lines        6893     6893           
  Branches      324      324           
=======================================
  Hits         6045     6045           
  Misses        617      617           
  Partials      231      231           

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