chore(package): update aegir to version 9.1.0 (#38)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -33,7 +33,7 @@
   },
   "homepage": "https://github.com/libp2p/js-peer-id",
   "devDependencies": {
-    "aegir": "^9.0.1",
+    "aegir": "^9.1.0",
     "chai": "^3.5.0",
     "pre-commit": "^1.1.3"
   },