add entry to expand set

[mmaelicke]

This PR closes #224

[codecov[bot]]

Codecov Report

Merging #225 (016ee4c) into master (5f40938) will decrease coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
- Coverage   59.11%   59.06%   -0.05%     
==========================================
  Files          75       75              
  Lines        3549     3545       -4     
==========================================
- Hits         2098     2094       -4     
  Misses       1451     1451              

Flag	Coverage Δ
e2e	59.06% <100.00%> (-0.05%)	:arrow_down:

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Impacted Files	Coverage Δ
metacatalog/util/results.py	68.59% <100.00%> (-0.52%)	:arrow_down:

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