fix: race condition on react HOC

src/react/index.js

@@ -21,16 +21,16 @@ export function observe(WrappedComponent) {
 
         const subscription = this.props[prop].subscribe(
           value => {
-            this.setState({
+            this.setState(state => ({
               observedValues: {
-                ...this.state.observedValues,
+                ...state.observedValues,
                 [prop]: value
               }
-            });
+            }));
           },
           err => {
             // TODO: pass the error to the wrapped component
-            console.err(err);
+            console.error(err);
           }
         );