updated README.md (#133)
updated README.md (#133)

* removed golangci badge
* related what's inside with links to the appropriate docs
* added our final statement about OpenAPI 3

* closes #111

Signed-off-by: Frederic BIDON <0906eec4e217633b417ff9bdf8c9fa633f82d5c8@yahoo.com>
go-openapi/validate,go-openapi/validate