Update walkstruct.go

Co-authored-by: David Sharnoff <[email protected]>

add default setter

Bump github.com/stretchr/testify from 1.7.0 to 1.9.0

Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.7.0 to 1.9.0.
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.7.0...v1.9.0)

---
updated-dependencies:
- dependency-name: github.com/stretchr/testify
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

add ForceJSON option for string decoding (#13)

* add ForceJSON option for string decoding

* update lint job

* more go versions

versioned names (#12)

add NonElement() (#11)

* add NonElement()

* lint

bugfix: options were not preserved for pointer types during unpack (#10)

lint

Merge pull request #8 from muir/duration

time.Duration & flag.Value

Merge pull request #7 from muir/negative-bools

for tag parsing of bools, can now specify antonyms