Fix compatibility with league/oauth2-client and PHP 7.1 (#14)

* Fix compatibility with league/oauth2-client and PHP 7.1

* Fix HHVM build on travis

.travis.yml

@@ -1,8 +1,11 @@
 language: php
 
+dist: trusty
+
 php:
   - 5.6
   - 7.0
+  - 7.1
   - hhvm
 
 before_script:
@@ -16,4 +19,4 @@ script:
 
 after_script:
   - wget https://scrutinizer-ci.com/ocular.phar
-  - php ocular.phar code-coverage:upload --format=php-clover coverage.clover
+  - php ocular.phar code-coverage:upload --format=php-clover coverage.clover

composer.json

@@ -21,8 +21,8 @@
         }
     ],
     "require": {
-        "php": ">=5.6.0 <7.1",
-        "league/oauth2-client": "1.*"
+        "php": ">=5.6.0",
+        "league/oauth2-client": "1.*|2.*"
     },
     "require-dev": {
         "mockery/mockery": "~0.9",

src/Provider/Slack.php

@@ -115,7 +115,12 @@ public function fetchAuthorizedUserDetails(AccessToken $token)
 
         $request = $this->getAuthenticatedRequest(self::METHOD_GET, $url, $token);
 
-        return $this->getResponse($request);
+        // Keep compatibility with League\OAuth2\Client v1
+        if (!method_exists($this, 'getParsedResponse')) {
+            return $this->getResponse($request);
+        }
+
+        return $this->getParsedResponse($request);
     }
 
     /**