Enable TypeScript strict mode

[rwalle61]

Should make development safer and easier

[codecov]

Codecov Report

Merging #254 (1f44cef) into master (d82d6f1) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #254   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          422       418    -4     
  Branches        60        65    +5     
=========================================
- Hits           422       418    -4     

Impacted Files	Coverage Δ
...t-openapi/src/matchers/toSatisfySchemaInApiSpec.ts	100.00% <ø> (ø)
.../openapi-validator/lib/classes/AbstractResponse.ts	100.00% <ø> (ø)
packages/jest-openapi/src/index.ts	100.00% <100.00%> (ø)
...ages/jest-openapi/src/matchers/toSatisfyApiSpec.ts	100.00% <100.00%> (ø)
...enapi-validator/lib/classes/AbstractOpenApiSpec.ts	100.00% <100.00%> (ø)
...ges/openapi-validator/lib/classes/AxiosResponse.ts	100.00% <100.00%> (ø)
...ages/openapi-validator/lib/classes/OpenApi2Spec.ts	100.00% <100.00%> (ø)
...ages/openapi-validator/lib/classes/OpenApi3Spec.ts	100.00% <100.00%> (ø)
...pi-validator/lib/classes/RequestPromiseResponse.ts	100.00% <100.00%> (ø)
...penapi-validator/lib/classes/SuperAgentResponse.ts	100.00% <100.00%> (ø)
... and 4 more

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