Fix: Deprecate SchemaValidator::isValid()

[localheinz]

This PR

• deprecates SchemaValidator::isValid()

[codecov]

Codecov Report

Merging #269 into master will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #269   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       161       161           
===========================================
  Files             34        34           
  Lines            521       521           
===========================================
  Hits             521       521           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 766c037...122ff9e. Read the comment docs.