run go fmt & go mod tidy on project

[andrewwormald]

Checksum mismatches can occur when go fmt is run on the package. This is purely to align with go fmt by running go fmt . and go mod tidy with nothing else done.

verifying github.com/ugorji/go/codec@v1.1.7: checksum mismatch
	downloaded: h1:2SvQaVZ1ouYrrKKwoSk2pzd4A9evlKJb9oTL+OaLUSs=
	go.sum:     h1:zVRFvIPbjpIMl2pf6vLXZTYXTo13zccQOe/LjQ3dqP8=

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'.

[andrewwormald]

I have verified that this occurs on quite a few different machines using the Goland IDE.

[andrewwormald]

@ugorji would you mind reviewing this as the issue persists?