fix: updating go.mod path

[sc250024]

Description

I tried running the following commands to install the CLI tool, but they all failed.

Build from source commands

$ go get -u -v github.com/gruntwork-io/git-xargs

go get: github.com/gruntwork-io/git-xargs@none updating to
    github.com/gruntwork-io/git-xargs@v0.0.3: parsing go.mod:
    module declares its path as: github.com/gruntwork-io/prototypes/git-xargs
            but was required as: github.com/gruntwork-io/git-xargs

$ go get -u -v github.com/gruntwork-io/git-xargs/cmd

go get: github.com/gruntwork-io/git-xargs@none updating to
    github.com/gruntwork-io/git-xargs@v0.0.3: parsing go.mod:
    module declares its path as: github.com/gruntwork-io/prototypes/git-xargs
            but was required as: github.com/gruntwork-io/git-xargs

$ go get -u -v github.com/gruntwork-io/prototypes/git-xargs

go get: module github.com/gruntwork-io/prototypes/git-xargs: git ls-remote -q origin in /Users/<my-user>/go/pkg/mod/cache/vcs/71e6a51a31709f8c15acf32385e11303f8c35b3ab4f6c4457aa458e205a40d1d: exit status 128:
    ERROR: Repository not found.
    fatal: Could not read from remote repository.

    Please make sure you have the correct access rights
    and the repository exists.

The go.mod path needs to be updated to support building from source.

• Go version: go version go1.16.3 darwin/amd64

[zackproser]

Good catch - thank you for fixing this!