chore: fix warnings (#4940)

Author: kevwan

core/discov/internal/registry_test.go

@@ -423,7 +423,7 @@ func TestRegistry_Monitor(t *testing.T) {
 	GetRegistry().clusters = map[string]*cluster{
 		getClusterKey(endpoints): {
 			watchers: map[watchKey]*watchValue{
-				watchKey{
+				{
 					key:        "foo",
 					exactMatch: true,
 				}: {
@@ -449,7 +449,7 @@ func TestRegistry_Unmonitor(t *testing.T) {
 	GetRegistry().clusters = map[string]*cluster{
 		getClusterKey(endpoints): {
 			watchers: map[watchKey]*watchValue{
-				watchKey{
+				{
 					key:        "foo",
 					exactMatch: true,
 				}: {

readme-cn.md

@@ -6,7 +6,6 @@
 
 [English](readme.md) | 简体中文
 
-[![Go](https://github.com/zeromicro/go-zero/workflows/Go/badge.svg?branch=master)](https://github.com/zeromicro/go-zero/actions)
 [![Go Report Card](https://goreportcard.com/badge/github.com/zeromicro/go-zero)](https://goreportcard.com/report/github.com/zeromicro/go-zero)
 [![goproxy](https://goproxy.cn/stats/github.com/zeromicro/go-zero/badges/download-count.svg)](https://goproxy.cn/stats/github.com/zeromicro/go-zero/badges/download-count.svg)
 [![codecov](https://codecov.io/gh/zeromicro/go-zero/branch/master/graph/badge.svg)](https://codecov.io/gh/zeromicro/go-zero)

readme.md

@@ -7,7 +7,6 @@ go-zero is a web and rpc framework with lots of builtin engineering practices. I
 
 <div align=center>
 
-[![Go](https://github.com/zeromicro/go-zero/workflows/Go/badge.svg?branch=master)](https://github.com/zeromicro/go-zero/actions)
 [![codecov](https://codecov.io/gh/zeromicro/go-zero/branch/master/graph/badge.svg)](https://codecov.io/gh/zeromicro/go-zero)
 [![Go Report Card](https://goreportcard.com/badge/github.com/zeromicro/go-zero)](https://goreportcard.com/report/github.com/zeromicro/go-zero)
 [![Release](https://img.shields.io/github/v/release/zeromicro/go-zero.svg?style=flat-square)](https://github.com/zeromicro/go-zero)