Bump rlp from 0.5.1 to 0.5.2 (#132)

Bumps [rlp](https://github.com/paritytech/parity-common) from 0.5.1 to 0.5.2.
- [Release notes](https://github.com/paritytech/parity-common/releases)
- [Commits](paritytech/parity-common@rlp-v0.5.1...rlp-v0.5.2)

---
updated-dependencies:
- dependency-name: rlp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

Author: dependabot[bot]