Release "swagger-v1.8.0"

This release includes the boilerplate codes so that devs don't have to write the boilerplate codes by themselves any longer. The boilerplate codes includes:

• 7 endpoints for v1:
  • swagger.json
  • swagger.yaml
  • openapi/v2.json
  • openapi/v2.yaml
  • openapi/v3.json
  • openapi/v3.yaml
  • swagger/ui
• 3 endpoints for v2+
  • swagger.{extension}
  • openapi/{version}.{extension}
  • swagger/ui

For more details of the usage, please find the document.