• Add --add-server to add a custom server when using --validate-server.
  This allows quickly adding a custom domain or base path that will properly
  validate.
• Add --header (short -H) option to specify a custom header when fetching
  the API document. This allows you to pass custom auth info.
• Add readOnly and writeOnly support to the example generator.
• Revamped support for --validate-server (short -s)
  • Requires the use of server base path(s) on the client.
  • Localhost is now always allowed on all known base paths.
  • Support for proxy headers (e.g. X-Forwarded-Host).
• Better support for resolving relative path references.
• Be more resilient to parser panics when using --watch
• Update Docker build to use Go 1.12 and Go modules.
• Enhance example-from-schema generation code. Support enums, string formats,
  array and object examples, min/max and min items.

• Add support for reloading OpenAPI URLs via /__reload on the server.
• Support external references in OpenAPI loader.
• Update dependencies, simplify file loading.
• Support jsonapi.org content type (application/vnd.api+json).
• Switch from dep to Go modules.

• Fix OPTIONS request to also include CORS headers.

• Added the --watch (short -w) parameter to reload whenever the input file
  changes. This currently only works when using files on disk.
• Update Docker build to use Go 1.11.
• Generate examples from schema when no example is available.
• Fix path parameter validation.
• Add CORS headers. Disable with --disable-cors.
• Documentation updates.

• Dependency updates, fixes string format validation bug.

Initial release.