Fix the bug of "checksum mismatch".
$ go build
go: downloading github.com/zzc-tongji/mydictionary/v4 v4.1.0
verifying github.com/zzc-tongji/mydictionary/v4@v4.1.0: checksum mismatch
downloaded: h1:slMg3fcLYvE9iufNqmec2jJUojv0qnGkPsbbiBor6EA=
go.sum: h1:7rgn+0Pys4fw+mXiD026rTzPuHto86BRxUia8FRNQSg=
SECURITY ERROR
This download does NOT match an earlier download recorded in go.sum.
The bits may have been replaced on the origin server, or an attacker may
have intercepted the download attempt.
For more information, see 'go help module-auth'.