fix(schematics): move ng-update under correct location

Author: jelbourn

src/lib/package.json

@@ -31,14 +31,12 @@
   },
   "schematics": "./schematics/collection.json",
   "ng-update": {
-    "requirements": {
-      "@angular/material": "^5",
-      "migrations": "./schematics/migration.json",
-      "packageGroup": [
-        "@angular/cdk",
-        "@angular/material-moment-adapter"
-      ]
-    }
+    "migrations": "./schematics/migration.json",
+    "packageGroup": [
+      "@angular/material",
+      "@angular/cdk",
+      "@angular/material-moment-adapter"
+    ]
   },
   "sideEffects": false
 }