Changed ' to " in sql query (#634)

CHANGELOG.rst

@@ -5,6 +5,7 @@ Changelog
 Not yet released
 ----------------
 
+* #634: Changed ' to " in sql query, both were used.
 * #629: Fix bug that made it impossible to check rdp:// and fixed port update.
 * b49659f: Added question to notification faq about not recieving notifications.
 * ef28908: Indentation fix.

src/psm/Util/Server/HistoryGraph.php

@@ -179,8 +179,8 @@ class HistoryGraph {
 		}
 
 		$records = $this->db->execute(
-			'SELECT *
-				FROM `'.PSM_DB_PREFIX."servers_$type`
+			"SELECT *
+				FROM `".PSM_DB_PREFIX."servers_$type`
 				WHERE `server_id` = :server_id AND `date` BETWEEN :start_time AND :end_time ORDER BY `date` ASC",
 			array(
 				'server_id' => $server_id,