chore: fix README

[stigbd]

Resolves #55

[codecov]

Codecov Report

Merging #56 (5a6a1fb) into main (7e21186) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #56   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines         1419      1423    +4     
=========================================
+ Hits          1419      1423    +4     

Impacted Files	Coverage Δ
src/datacatalogtordf/agent.py	100.00% <100.00%> (ø)
src/datacatalogtordf/catalog.py	100.00% <100.00%> (ø)
src/datacatalogtordf/catalogrecord.py	100.00% <100.00%> (ø)
src/datacatalogtordf/dataset.py	100.00% <100.00%> (ø)
src/datacatalogtordf/distribution.py	100.00% <100.00%> (ø)
src/datacatalogtordf/document.py	100.00% <100.00%> (ø)
src/datacatalogtordf/exceptions.py	100.00% <100.00%> (ø)
src/datacatalogtordf/location.py	100.00% <100.00%> (ø)
src/datacatalogtordf/periodoftime.py	100.00% <100.00%> (ø)
src/datacatalogtordf/relationship.py	100.00% <100.00%> (ø)
... and 1 more

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