Fixed to match redux-observable 0.13.0

Interface of EpicMiddleware changed from EpicMiddleware<T> to EpicMiddleware<T, S>

Author: actra-gschuster

src/epic-decorator.ts

@@ -26,7 +26,7 @@ export function getEpicsMetadata(instance: any): EpicMetadata[] {
 
 }
 
-export function createEpics<T>(...instances: any[]): EpicMiddleware<T> {
+export function createEpics<T, S>(...instances: any[]): EpicMiddleware<T, S> {
   const epicsMetaData = instances
     .map(instance => getEpicsMetadata(instance)
       .map(({propertyName}) => instance[propertyName]));
@@ -35,4 +35,4 @@ export function createEpics<T>(...instances: any[]): EpicMiddleware<T> {
   const rootEpic = combineEpics<T>(...epics);
   return createEpicMiddleware<T>(rootEpic);
 
-}
+}