Issue #94 Problem with data type and markdown library.

[martinconstante]

Modify datatypes on schema.py
Add libraries to generate markdown documentation.

[codecov-io]

Codecov Report

Merging #95 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   93.55%   93.55%           
=======================================
  Files          86       86           
  Lines        2559     2559           
=======================================
  Hits         2394     2394           
  Misses        165      165           

Impacted Files	Coverage Δ
connect/models/schemas.py	94.94% <100.00%> (ø)

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