Correct copyright statement in the README

[daanboer]

As suggested by Leanne, to comply with the by-laws.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.06%. Comparing base (5699869) to head (e4fbdc9).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #835      +/-   ##
==========================================
+ Coverage   80.31%   82.06%   +1.74%     
==========================================
  Files         181      125      -56     
  Lines        8404     7772     -632     
  Branches      871      788      -83     
==========================================
- Hits         6750     6378     -372     
+ Misses       1600     1364     -236     
+ Partials       54       30      -24     

Flag	Coverage Δ
app	?
converter	61.16% <ø> (ø)
database	79.58% <ø> (ø)
schema	93.16% <ø> (ø)

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