fix: wrong package name

tool/kratos/tool_index.go

@@ -16,7 +16,7 @@ var toolIndexs = []*Tool{
 		Name:      "protoc",
 		Alias:     "kratos-protoc",
 		BuildTime: time.Date(2019, 5, 4, 0, 0, 0, 0, time.Local),
-		Install:   "go get -u github.com/bilibili/kratos/tool/krotos-protoc",
+		Install:   "go get -u github.com/bilibili/kratos/tool/kratos-protoc",
 		Summary:   "快速方便生成pb.go的protoc封装，windows、Linux请先安装protoc工具",
 		Platform:  []string{"darwin", "linux", "windows"},
 		Author:    "kratos",