**请简单描述bug的场景** go 1.13.4 go mod require github.com/zouyx/agollo v2.2.1+incompatible **如何重现** go mod tidy 出现 verifying github.com/zouyx/agollo@v2.2.1+incompatible/go.mod: github.com/zouyx/agollo@v2.2.1+incompatible/go.mod: reading https://goproxy.cn/sumdb/sum.golang.org/lookup/github.com/zouyx/agollo@v2.2.1+incompatible: 404 Not Found **go env** GO111MODULE="on" GOARCH="amd64" GOBIN="" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GONOPROXY="" GONOSUMDB="" GOOS="darwin" GOPRIVATE="" GOPROXY="https://goproxy.cn,direct" GOROOT="/usr/local/Cellar/go/1.13.4/libexec" GOSUMDB="sum.golang.org" GOTMPDIR="" GOTOOLDIR="/usr/local/Cellar/go/1.13.4/libexec/pkg/tool/darwin_amd64" GCCGO="gccgo" AR="ar" CC="clang" CXX="clang++" CGO_ENABLED="1" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/jc/0zx17bhd0tgfk632ddj_r3d40000gn/T/go-build785361234=/tmp/go-build -gno-record-gcc-switches -fno-common" **期望** 正常下载 **截图** 如有 **Agollo 版本 :** - Version [e.g. 22] **日志信息** **其他上下文** 如有