fix: Adding peer deps to setup (christopher-caldwell#22)

README.md

@@ -53,6 +53,17 @@ Shout out to all the contributors.
 yarn add @caldwell619/react-kanban
 ```
 
+You will also need to install the peer dependencies on your own:
+```json
+  "peerDependencies": {
+    "react": ">=16",
+    "react-dom": ">=16",
+    "@hello-pangea/dnd": ">=16"
+  },
+```
+
+These are listed as peer dependencies because I do not want to pin specific versions as dependencies if you are already using them.
+
 ## Usage
 
 There are 2 main boards, `Controlled` and `Uncontrolled`.