Bump protocol-buffers from 4.2.0 to 5.0.0 (#3)

Bumps [protocol-buffers](https://github.com/mafintosh/protocol-buffers) from 4.2.0 to 5.0.0.
- [Release notes](https://github.com/mafintosh/protocol-buffers/releases)
- [Commits](mafintosh/protocol-buffers@v4.2.0...v5.0.0)

---
updated-dependencies:
- dependency-name: protocol-buffers
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

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

package.json

@@ -42,7 +42,7 @@
     "level-read-stream": "^1.1.0",
     "memory-level": "^1.0.0",
     "nyc": "^15.1.0",
-    "protocol-buffers": "^4.0.2",
+    "protocol-buffers": "^5.0.0",
     "readable-stream": "^3.6.0",
     "standard": "^16.0.3",
     "tape": "^5.0.1",