Merge pull request #28 from eventfarm/feature/add-public-functionalit…

…y-to-restforce-to-refresh-the-user-token

Fixed minor errors with refresh token

src/Rest/GuzzleRestClient.php

@@ -114,4 +114,9 @@ private function containsTrailingSlash(string $baseUri): bool
     {
         return substr($baseUri, -1) === '/';
     }
+
+    public function refreshToken(): ?OAuthAccessToken
+    {
+        return null;
+    }
 }

src/Restforce.php

@@ -119,7 +119,7 @@ public function query(string $queryString): ResponseInterface
         ]);
     }
 
-    public function refreshToken(): OAuthAccessToken
+    public function refreshToken(): ?OAuthAccessToken
     {
         return $this->getOAuthRestClient()->refreshToken();
     }

src/RestforceInterface.php

@@ -14,5 +14,5 @@ public function update(string $sobjectType, string $sobjectId, array $data): Res
     public function describe(string $sobjectType): ResponseInterface;
     public function find(string $sobjectType, string $sobjectId, array $fields = []): ResponseInterface;
     public function getNext(string $url): ResponseInterface;
-    public function refreshToken(): OAuthAccessToken;
+    public function refreshToken(): ?OAuthAccessToken;
 }