fix module cycle

packages/satcheljs-promise/lib/actionStack.ts

@@ -0,0 +1,7 @@
+let actionStack: string[] = [];
+
+export function getCurrentAction() {
+    return actionStack.length ? actionStack[actionStack.length - 1] : null;
+}
+
+export default actionStack;

packages/satcheljs-promise/lib/actionWrappers.ts

@@ -1,5 +1,5 @@
 import { action } from 'satcheljs';
-import { getCurrentAction } from './promiseMiddleware';
+import { getCurrentAction } from './actionStack';
 
 export function wrapThen(originalThen: any) {
     return function wrappedThen(onFulfilled?: Function, onRejected?: Function) {

packages/satcheljs-promise/lib/promiseMiddleware.ts

@@ -1,7 +1,7 @@
 import { DispatchFunction, ActionFunction, ActionContext } from 'satcheljs';
 import install from './install';
+import actionStack from './actionStack';
 
-let actionStack: string[] = [];
 let isInstalled = false;
 let uninstall: () => void;