Bump h2 from 0.4.1 to 0.4.2

Bumps [h2](https://github.com/hyperium/h2) from 0.4.1 to 0.4.2.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/hyperium/h2/compare/v0.4.1...v0.4.2)

---
updated-dependencies:
- dependency-name: h2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -572,9 +572,9 @@ checksum = "4271d37baee1b8c7e4b708028c57d816cf9d2434acb33a549475f78c181f6253"
 
 [[package]]
 name = "h2"
-version = "0.4.1"
+version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "991910e35c615d8cab86b5ab04be67e6ad24d2bf5f4f11fdbbed26da999bbeab"
+checksum = "31d030e59af851932b72ceebadf4a2b5986dba4c3b99dd2493f8273a0f151943"
 dependencies = [
  "bytes",
  "fnv",