Fix exclusiveMinimum and exclusiveMaximum for OpenAPI 3.0

[justin-tay]

Closes #1114

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.11%. Comparing base (48ca3c2) to head (da53d7a).
Report is 57 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1115      +/-   ##
============================================
- Coverage     78.90%   78.11%   -0.80%     
- Complexity     1965     2073     +108     
============================================
  Files           172      201      +29     
  Lines          6352     6889     +537     
  Branches       1255     1265      +10     
============================================
+ Hits           5012     5381     +369     
- Misses          867     1034     +167     
- Partials        473      474       +1     

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[jkosternl]

Thanks Justin!