Update documentation to cover .NET Standand, .NET Core (!3772) · Merge requests · OpenAPI Tools / openapi-generator

Merged William Cheng requested to merge wing328-patch-netcore into master Aug 28, 2019

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Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh, ./bin/openapi3/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\. If contributing template-only or documentation-only changes which will change sample output, be sure to build the project first.
Filed the PR against the correct branch: master, 4.1.x, 5.0.x. Default: master.
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