fix: #226 Support default response status

[ad-walker]

Issue/feature request: https://github.com/openapi-library/OpenAPIValidators/issues/226

• default response status when provided will catch unspecified response codes
• Updated tests and error messages
• Incremented port number of exampleApp to 5001 to avoid UPNP conflicts
• Changes to issues template applied by linter

cc: @rwalle61 based on comments re: original issue

[codecov[bot]]

Codecov Report

Merging #271 (3c88cbd) into master (9511b66) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #271   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          418       419    +1     
  Branches        63        65    +2     
=========================================
+ Hits           418       419    +1     

Impacted Files	Coverage Δ
...ages/jest-openapi/src/matchers/toSatisfyApiSpec.ts	100.00% <ø> (ø)
...enapi-validator/lib/classes/AbstractOpenApiSpec.ts	100.00% <100.00%> (ø)

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