fix: user specified hiar style

Author: wwayne

src/index.tsx

@@ -62,7 +62,7 @@ export default class ReactNiceAvatar extends Component<NiceAvatarProps> {
         break;
       }
     }
-
+    
     return (
       <div
         id={id}

src/utils.ts

@@ -186,6 +186,8 @@ export const genConfig: GenConfigFunc = (userConfig = {}) => {
         break;
       }
     }
+  } else {
+    response.hairStyle = userConfig.hairStyle
   }
 
   // Hat