Fix broken link for notebooks

[foldfelis]

Close #47

[codecov]

Codecov Report

Merging #48 (351b70c) into master (91e49d0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   91.78%   91.78%           
=======================================
  Files           5        5           
  Lines          73       73           
=======================================
  Hits           67       67           
  Misses          6        6           

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