fix: fixed missing namespace for CouchException

Author: phodoval

src/CouchException.php

@@ -1,4 +1,6 @@
 <?php
-class CouchException extends Exception {
+namespace Phodoval\CouchDB;
 
-}
+use Exception;
+
+class CouchException extends Exception {}

src/Database.php

@@ -1,7 +1,6 @@
 <?php
 namespace Phodoval\CouchDB;
 
-use CouchException;
 use GuzzleHttp\Exception\GuzzleException;
 
 class Database {