chore(deps-dev): bump bl from 5.1.0 to 6.0.0 (#29)

Bumps [bl](https://github.com/rvagg/bl) from 5.1.0 to 6.0.0.
- [Release notes](https://github.com/rvagg/bl/releases)
- [Changelog](https://github.com/rvagg/bl/blob/master/CHANGELOG.md)
- [Commits](rvagg/bl@v5.1.0...v6.0.0)

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

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package.json

@@ -23,7 +23,7 @@
     "individual": "^3.0.0"
   },
   "devDependencies": {
-    "bl": "^5.0.0",
+    "bl": "^6.0.0",
     "hyperquest": "^2.1.3",
     "list-stream": "^2.0.0",
     "standard": "^17.0.0",