Update to latest Guzzle

composer.json

@@ -1,27 +1,27 @@
 {
-  "name":        "jleagle/sick-beard-api-client",
-  "keywords":    [
+  "name": "jleagle/sick-beard-api-client",
+  "keywords": [
     "sick beard",
     "sickbeard",
     "api",
     "client"
   ],
   "description": "A wrapper class for the Sick Beard API.",
-  "authors":     [
+  "authors": [
     {
-      "name":     "James Eagle",
-      "email":    "jimeagle@gmail.com",
+      "name": "James Eagle",
+      "email": "jimeagle@gmail.com",
       "homepage": "http://jimeagle.com",
-      "role":     "Developer"
+      "role": "Developer"
     }
   ],
-  "autoload":    {
+  "autoload": {
     "psr-4": {
       "Jleagle\\SickBeard\\": "src"
     }
   },
-  "require":     {
-    "php":               ">=5.4",
-    "guzzlehttp/guzzle": "~5.2"
+  "require": {
+    "php": ">=5.4",
+    "guzzlehttp/guzzle": "~6.0"
   }
 }

src/SickBeard.php

@@ -763,7 +763,7 @@ protected function _request($params)
     $body = $response->getBody();
     $contentType = $response->getHeader('content-type');
 
-    if(strpos($contentType, 'json') !== false)
+    if(strpos($contentType[0], 'json') !== false)
     {
       $array = json_decode($body, true);
 
@@ -776,7 +776,7 @@ protected function _request($params)
     }
     else
     {
-      header('Content-Type: ' . $contentType);
+      header('Content-Type: ' . $contentType[0]);
       return $body;
     }
   }