docs(readme): registry example moved to scoped registries

Author: ashblue

README.md

@@ -20,11 +20,19 @@ See upcoming features and development progress on the [Trello Board](https://tre
 
 ## Getting Started
 
-Fluid Behavior Tree is used through [Unity's Package Manager](https://docs.unity3d.com/Manual/CustomPackages.html). In order to use it you'll need to add the following two lines to your `Packages/manifest.json` file. After that you'll be able to visually control what specific version of Fluid Behavior Tree you're using from the package manager window in Unity.
+Fluid Behavior Tree is used through [Unity's Package Manager](https://docs.unity3d.com/Manual/CustomPackages.html). In order to use it you'll need to add the following lines to your `Packages/manifest.json` file. After that you'll be able to visually control what specific version of Fluid Behavior Tree you're using from the package manager window in Unity. This has to be done so your Unity editor can connect to NPM's package registry.
 
 ```json
 {
-  "registry": "https://registry.npmjs.org",
+  "scopedRegistries": [
+    {
+      "name": "NPM",
+      "url": "https://registry.npmjs.org",
+      "scopes": [
+        "com.fluid"
+      ]
+    }
+  ],
   "dependencies": {
     "com.fluid.behavior-tree": "2.0.1"
   }