expose clearCache method

Author: farfromrefug

src/index.d.ts

@@ -6,6 +6,7 @@ export function disableSSLPinning();
 
 export function request(options: Https.HttpsRequestOptions): Promise<Https.HttpsResponse>;
 export function setCache(options?: Https.CacheOptions)
+export function clearCache()
 export function createRequest(opts: Https.HttpsRequestOptions): Https.HttpsRequest;
 
 export * from './https.common';