fix: not throwing errors when multiple updates happen

Author: vesparny

src/state.js

@@ -18,22 +18,16 @@ class State extends Component {
       : props.select(this.broadcast.getState())
     this.update = this.update.bind(this)
     this.setStateIfNeeded = this.setStateIfNeeded.bind(this)
-    this.isUpdating = false
   }
 
   update (updaterFn) {
     if (this.props.state) {
       this.setState(updaterFn)
     } else {
-      if (this.isUpdating) {
-        throw new Error('Updaters may not invoke update function.')
-      }
-      this.isUpdating = true
       const oldState = this.broadcast.getState()
       const nextState = updaterFn(oldState)
       this.inspect && this.inspect(oldState, nextState, updaterFn)
       this.broadcast.setState(nextState)
-      this.isUpdating = false
     }
   }