Bump fortio.org/struct2env from 0.4.1 to 0.4.2 (#73)

Bumps [fortio.org/struct2env](https://github.com/fortio/struct2env) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/fortio/struct2env/releases)
- [Commits](fortio/struct2env@v0.4.1...v0.4.2)

---
updated-dependencies:
- dependency-name: fortio.org/struct2env
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -3,6 +3,6 @@ module fortio.org/log
 go 1.18
 
 require (
-	fortio.org/struct2env v0.4.1
+	fortio.org/struct2env v0.4.2
 	github.com/kortschak/goroutine v1.1.2
 )

go.sum

@@ -1,4 +1,4 @@
-fortio.org/struct2env v0.4.1 h1:rJludAMO5eBvpWplWEQNqoVDFZr4RWMQX7RUapgZyc0=
-fortio.org/struct2env v0.4.1/go.mod h1:lENUe70UwA1zDUCX+8AsO663QCFqYaprk5lnPhjD410=
+fortio.org/struct2env v0.4.2 h1:Xh7HlS9vf2ZdRvRfmoGIasNDO8t6z36M713utVODRCo=
+fortio.org/struct2env v0.4.2/go.mod h1:lENUe70UwA1zDUCX+8AsO663QCFqYaprk5lnPhjD410=
 github.com/kortschak/goroutine v1.1.2 h1:lhllcCuERxMIK5cYr8yohZZScL1na+JM5JYPRclWjck=
 github.com/kortschak/goroutine v1.1.2/go.mod h1:zKpXs1FWN/6mXasDQzfl7g0LrGFIOiA6cLs9eXKyaMY=