fix(CacheMiddleware): cached forced requests (thanks @NappyPirate)

* Added a flag to the cache middleware to configure the caching of forced requests

* Updated readme to include the new cacheForcedRequests flag

* Always cached forced requests by default

* Made sure to define queryId and variables

src/middlewares/cache.js

@@ -39,7 +39,12 @@ export default function queryMiddleware(opts?: CacheMiddlewareOpts): Middleware
     }
 
     if (req.cacheConfig && req.cacheConfig.force) {
-      return next(req);
+      const queryId = req.getID();
+      const variables = req.getVariables();
+      const res = await next(req);
+
+      cache.set(queryId, variables, res);
+      return res;
     }
 
     try {