chore(package): update aegir to version 7.0.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -38,7 +38,7 @@
     "run-series": "^1.1.4"
   },
   "devDependencies": {
-    "aegir": "^6.0.0"
+    "aegir": "^7.0.0"
   },
   "contributors": [
     "David Dias <[email protected]>",