Fixed typo that would cause things to fail.

src/Users/ModNotes.php

@@ -149,7 +149,7 @@ class ModNotes {
         foreach($noteInfos as $noteInfo) {
             if($noteInfo instanceof ModNoteInfo)
                 $noteInfo = $noteInfo->getId();
-            elseif(!is_string($noteInfos))
+            elseif(!is_string($noteInfo))
                 throw new InvalidArgumentException('$noteInfos must be strings of instances of ModNoteInfo');
 
             $stmt->addParameter(++$args, $noteInfo);