Fix support for rxjs v6.6.3 (#397) (#398)

Author: epodol

src/auth.tsx

@@ -2,7 +2,7 @@ import firebase from 'firebase/app';
 import * as React from 'react';
 import { user } from 'rxfire/auth';
 import { preloadAuth, preloadObservable, ReactFireOptions, useAuth, useObservable, ObservableStatus, ReactFireError } from './';
-import { from, lastValueFrom, of } from 'rxjs';
+import { from, of } from 'rxjs';
 import { map, switchMap } from 'rxjs/operators';
 import { useSuspenseEnabledFromConfigAndContext } from './firebaseApp';
 
@@ -11,7 +11,7 @@ export function preloadUser(options: { firebaseApp: firebase.app.App }) {
 
   return preloadAuth({ firebaseApp }).then(auth => {
     const result = preloadObservable(user(auth()), `auth:user:${firebaseApp.name}`);
-    return lastValueFrom(result);
+    return result.toPromise();
   });
 }
 

yarn.lock

@@ -10612,9 +10612,9 @@ rxjs@^6.4.0, rxjs@^6.6.0:
     tslib "^1.9.0"
 
 "rxjs@^6.6.3 || ^7.0.1":
-  version "7.1.0"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.1.0.tgz#94202d27b19305ef7b1a4f330277b2065df7039e"
-  integrity sha512-gCFO5iHIbRPwznl6hAYuwNFld8W4S2shtSJIqG27ReWXo9IWrCyEICxUA+6vJHwSR/OakoenC4QsDxq50tzYmw==
+  version "7.2.0"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-7.2.0.tgz#5cd12409639e9514a71c9f5f9192b2c4ae94de31"
+  integrity sha512-aX8w9OpKrQmiPKfT1bqETtUr9JygIz6GZ+gql8v7CijClsP0laoFUdKzxFAoWuRdSlOdU2+crss+cMf+cqMTnw==
   dependencies:
     tslib "~2.1.0"