chore: add standard devenv.nix #5

...mod/github.com/davecgh/go-spew@v1.1.1/spew/format_test.go

...d/github.com/davecgh/go-spew@v1.1.1/spew/internal_test.go

...ub.com/davecgh/go-spew@v1.1.1/spew/internalunsafe_test.go

...go/pkg/mod/github.com/davecgh/go-spew@v1.1.1/spew/spew.go

...g/mod/github.com/davecgh/go-spew@v1.1.1/spew/spew_test.go

...g/mod/github.com/davecgh/go-spew@v1.1.1/test_coverage.txt

.../pkg/mod/github.com/pmezard/go-difflib@v1.0.0/.travis.yml

...e/go/pkg/mod/github.com/pmezard/go-difflib@v1.0.0/LICENSE

...go/pkg/mod/github.com/pmezard/go-difflib@v1.0.0/README.md

...d/github.com/pmezard/go-difflib@v1.0.0/difflib/difflib.go

...hub.com/pmezard/go-difflib@v1.0.0/difflib/difflib_test.go

...o/pkg/mod/github.com/stretchr/testify@v1.8.2/.ci.gofmt.sh

.../mod/github.com/stretchr/testify@v1.8.2/.ci.gogenerate.sh

...o/pkg/mod/github.com/stretchr/testify@v1.8.2/.ci.govet.sh

...github.com/stretchr/testify@v1.8.2/.github/dependabot.yml

.../stretchr/testify@v1.8.2/.github/pull_request_template.md

...ub.com/stretchr/testify@v1.8.2/.github/workflows/main.yml

.../go/pkg/mod/github.com/stretchr/testify@v1.8.2/.gitignore

...kg/mod/github.com/stretchr/testify@v1.8.2/CONTRIBUTING.md

...ate/go/pkg/mod/github.com/stretchr/testify@v1.8.2/LICENSE