Merge pull request #118 from jacklul/hotfix

Fix minor mistakes

src/Entities/Document.php

@@ -44,7 +44,7 @@ class Document extends Entity
         return $this->file_id;
     }
 
-    public function getthumb()
+    public function getThumb()
     {
           return $this->thumb;
     }

src/Entities/Video.php

@@ -75,7 +75,7 @@ class Video extends Entity
     {
          return $this->thumb;
     }
-    public function getTimeType()
+    public function getMimeType()
     {
          return $this->mime_type;
     }