Fix accidentally removed re-exports

Author: markerikson

src/index.ts

@@ -1,3 +1,7 @@
+export { combineReducers, compose } from 'redux'
+export { default as createNextState } from 'immer'
+export { default as createSelector } from 'selectorator'
+
 export * from './configureStore'
 export * from './createAction'
 export * from './createReducer'