Updated peer dependencies to reflect upgrade to v4

Author: pascalgagneur

lib/ChatBot.jsx

@@ -34,11 +34,11 @@ class ChatBot extends Component {
     this.content = null;
     this.input = null;
 
-    this.setContentRef = element => {
+    this.setContentRef = (element) => {
       this.content = element;
     };
 
-    this.setInputRef = element => {
+    this.setInputRef = (element) => {
       this.input = element;
     };
 

package.json

@@ -89,8 +89,8 @@
     "react-dom": "^16.4.1"
   },
   "peerDependencies": {
-    "styled-components": ">= 2.0.0 < 4",
-    "react": "^16.x",
-    "react-dom": "^16.x"
+    "styled-components": "^4.0.0",
+    "react": "^16.3.0",
+    "react-dom": "^16.3.0"
   }
-}
+}