Hide all modules except prelude

[moCello]

Resolves #782

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (97240ce) 85.63% compared to head (5126831) 85.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #801   +/-   ##
=======================================
  Coverage   85.63%   85.63%           
=======================================
  Files          57       57           
  Lines        4128     4128           
=======================================
  Hits         3535     3535           
  Misses        593      593           

Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)

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