fix: Show only filename in HTML output

[kesara]

Fixes #26

[codecov-commenter]

Codecov Report

Merging #28 (c00570c) into main (9e7081d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #28   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          122       125    +3     
=========================================
+ Hits           122       125    +3     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
iddiff/iddiff.py	100.00% <100.00%> (ø)

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