fix(overmind): wrong call on exit on statemachine

Author: christianalfoni

packages/node_modules/overmind/src/statemachine.ts

@@ -1,7 +1,5 @@
 import { PROXY_TREE, VALUE } from 'proxy-state-tree'
 
-import { Derive } from './'
-
 export type StatemachineDefinition<States extends string> = {
   initial: States,
   states: {
@@ -27,7 +25,7 @@ class StateMachine<States extends string>  {
     Object.keys(definition.states).reduce((aggr, key) => {
       aggr[key] = function (entry, exit) {
         if (definition.states[this.current].includes(key as any)) {
-          if (this[CURRENT_EXIT]) this._currentExit()
+          if (this[CURRENT_EXIT]) this[CURRENT_EXIT]()
           this[VALUE][CURRENT_EXIT] = exit
           this.current = key as any
           const tree = (this[PROXY_TREE].master.mutationTree || this[PROXY_TREE])