Add missing ignore for paper

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.80%. Comparing base (e367b37) to head (5daf7eb). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #282 +/- ## ======================================= Coverage 91.80% 91.80% ======================================= Files 23 23 Lines 2197 2197 ======================================= Hits 2017 2017 Misses 180 180 ```

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