Fix typo in schema.py: vaidated->validated

[drootnar]

Fix typo in schema.py: vaidated -> validated

[codecov-io]

Codecov Report

Merging #151 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #151   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files           1        1           
  Lines         214      214           
=======================================
  Hits          209      209           
  Misses          5        5

Impacted Files	Coverage Δ
schema.py	97.66% <ø> (ø)	⬆️

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[skorokithakis]

Thank you!