chore(package): update aegir to version 8.0.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -22,7 +22,7 @@
   "author": "Friedel Ziegelmayer <dignifiedquire@gmail.com>",
   "license": "MIT",
   "devDependencies": {
-    "aegir": "^6.0.1",
+    "aegir": "^8.0.0",
     "chai": "^3.5.0",
     "interface-pull-blob-store": "^0.5.0",
     "rimraf": "^2.5.4"