chore(deps-dev): bump aegir from 20.6.1 to 21.0.2 (#167)

Bumps [aegir](https://github.com/ipfs/aegir) from 20.6.1 to 21.0.2.
- [Release notes](https://github.com/ipfs/aegir/releases)
- [Changelog](https://github.com/ipfs/aegir/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ipfs/aegir/compare/v20.6.1...v21.0.2)

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

package.json

@@ -61,7 +61,7 @@
     "@types/dirty-chai": "^2.0.2",
     "@types/mocha": "^5.2.7",
     "@types/sinon": "^7.5.1",
-    "aegir": "^20.4.1",
+    "aegir": "^21.0.2",
     "benchmark": "^2.1.4",
     "chai": "^4.2.0",
     "chai-string": "^1.5.0",