doc: retired gocard report badge (#64)

Signed-off-by: Frédéric BIDON <fredbi@yahoo.com>

Author: fredbi

README.md

@@ -5,7 +5,7 @@
 <!-- Badges: release & docker images  -->
 <!-- Badges: code quality  -->
 <!-- Badges: license & compliance -->
-[![Release][release-badge]][release-url] [![Go Report Card][gocard-badge]][gocard-url] [![CodeFactor Grade][codefactor-badge]][codefactor-url] [![License][license-badge]][license-url]
+[![Release][release-badge]][release-url] [gocard-url] [![CodeFactor Grade][codefactor-badge]][codefactor-url] [![License][license-badge]][license-url]
 <!-- Badges: documentation & support -->
 <!-- Badges: others & stats -->
 [![GoDoc][godoc-badge]][godoc-url] [![Discord Channel][discord-badge]][discord-url] [![go version][goversion-badge]][goversion-url] ![Top language][top-badge] ![Commits since latest release][commits-badge]
@@ -98,8 +98,6 @@ Maintainers can cut a new release by either:
 [gomod-badge]: https://badge.fury.io/go/github.com%2Fgo-openapi%2Finflect.svg
 [gomod-url]: https://badge.fury.io/go/github.com%2Fgo-openapi%2Finflect
 <!-- Badges: code quality  -->
-[gocard-badge]: https://goreportcard.com/badge/github.com/go-openapi/inflect
-[gocard-url]: https://goreportcard.com/report/github.com/go-openapi/inflect
 [codefactor-badge]: https://img.shields.io/codefactor/grade/github/go-openapi/inflect
 [codefactor-url]: https://www.codefactor.io/repository/github/go-openapi/inflect
 <!-- Badges: documentation & support -->