fix import in example code

[splendido]

there is no pyArango.validator module: it was probably a typo

[codecov-io]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #61   +/-   ##
=======================================
  Coverage   82.92%   82.92%           
=======================================
  Files          12       12           
  Lines        1775     1775           
=======================================
  Hits         1472     1472           
  Misses        303      303

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[tariqdaouda]

True. Thank you!