Modify TOC depth

[betatim]

Fixes #158 not sure this is really an improvement as it makes it very long.

• Is it mergeable?
• make test Did it pass the tests?
• make coverage Is the new code covered?
• Did it change the command-line interface? Only additions are allowed
  without a major version increment. Changing file formats also requires a
  major version number increment.
• Was a spellchecker run on the source code and documentation after
  changes were made?

[betatim]

WDYT?

[codecov-io]

Codecov Report

Merging #193 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #193   +/-   ##
=======================================
  Coverage   85.42%   85.42%           
=======================================
  Files          13       13           
  Lines        1894     1894           
  Branches       52       52           
=======================================
  Hits         1618     1618           
  Misses        265      265           
  Partials       11       11

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[luizirber]

Updated via #216