Add spacing in update queries to match where conditions

Author: JulianVennen

src/Query/Generator/SQL.php

@@ -237,7 +237,7 @@ private function generateFields(Query $query): string
                 }
 
             } else if ($field instanceof UpdateField) {
-                $fieldStrings[] = $this->columnEnclosure . $field->key . $this->columnEnclosure . "=" . $this->generateValue($field->value);
+                $fieldStrings[] = $this->columnEnclosure . $field->key . $this->columnEnclosure . " = " . $this->generateValue($field->value);
             }
         }