Fix broken link in "Other software docs"

[sobolevnrm]

Fixes #363

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cf02b83) 65.39% compared to head (44dad50) 65.39%.

❗ Current head 44dad50 differs from pull request most recent head fe0b005. Consider uploading reports for the commit fe0b005 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #364   +/-   ##
=======================================
  Coverage   65.39%   65.39%           
=======================================
  Files          30       30           
  Lines        7789     7789           
=======================================
  Hits         5094     5094           
  Misses       2695     2695           

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