linkedin: oauth scope parameter is mandatory with v2

Default to basic "Sign In with LinkedIn" scopes.

https://docs.microsoft.com/en-gb/linkedin/consumer/integrations/self-serve/sign-in-with-linkedin

Signed-off-by: Valentin Kunz <valentin.kunz@b-ite.de>

Author: Valentin Kunz

src/OAuth/OAuth2/Service/Linkedin.php

@@ -41,6 +41,10 @@ public function __construct(
         $scopes = array(),
         UriInterface $baseApiUri = null
     ) {
+        if (count($scopes) === 0) {
+            $scopes = array(self::SCOPE_R_LITEPROFILE, self::SCOPE_R_EMAILADDRESS);
+        }
+
         parent::__construct($credentials, $httpClient, $storage, $scopes, $baseApiUri, true);
 
         if (null === $baseApiUri) {