amber cli: Require grunt 1.

external/amber-cli/package.json

@@ -41,7 +41,7 @@
   },
   "peerDependencies": {
     "grunt-init": "^0.3.1",
-    "grunt-cli": "^0.1.13"
+    "grunt-cli": "^1.2.0"
   },
   "devDependencies": {
     "shelljs": "^0.3.0"