ref: make badges smaller

Author: Josh

README.md

@@ -1,7 +1,7 @@
 # protoc-gen-openapi
 
-![build status](https://img.shields.io/github/actions/workflow/status/technicallyjosh/protoc-gen-openapi/run-lint.yaml?style=for-the-badge)
-[![Go Report Card](https://goreportcard.com/badge/github.com/technicallyjosh/protoc-gen-openapi?style=for-the-badge)](https://goreportcard.com/report/github.com/technicallyjosh/protoc-gen-openapi)
+![build status](https://img.shields.io/github/actions/workflow/status/technicallyjosh/protoc-gen-openapi/run-lint.yaml?style=flat-square)
+[![Go Report Card](https://goreportcard.com/badge/github.com/technicallyjosh/protoc-gen-openapi?style=flat-square)](https://goreportcard.com/report/github.com/technicallyjosh/protoc-gen-openapi)
 
 **Yes**, this is _another_ protoc generator for OpenAPI. I created this for a
 couple