fix: Add missing types definition into CarouselStoreInterface (#237)

* Add missing import into README.md

* Add missing types definition into CarouselStoreInterface

Author: cbasJS

README.md

@@ -541,7 +541,7 @@ Note that you will likely need to subscribe/unsubscribe to changes in order to t
 Example:
 
 ```js
-import React, { useContext } from 'react';
+import React, { useContext, useEffect } from 'react';
 import { CarouselContext } from 'pure-react-carousel';
 
 export function MyComponentUsingContext() {

typings/index.d.ts

@@ -59,11 +59,11 @@ interface CarouselStoreInterface {
   readonly subscribe: (func: () => void) => void
   readonly unsubscribe: (func: () => void) => void
   readonly updateSubscribers: (cb?: (state: CarouselState) => void) => void
-  readonly subscribeMasterSpinner: (src) => void
-  readonly unsubscribeMasterSpinner: (src) => false | object
+  readonly subscribeMasterSpinner: (src: string) => void
+  readonly unsubscribeMasterSpinner: (src: string) => false | object
   readonly unsubscribeAllMasterSpinner: () => void
-  readonly masterSpinnerSuccess: (src) => void
-  readonly masterSpinnerError: (src) => void
+  readonly masterSpinnerSuccess: (src: string) => void
+  readonly masterSpinnerError: (src: string) => void
   readonly setMasterSpinnerFinished: () => void
   readonly isMasterSpinnerFinished: () => boolean
 }