Avoid regex multiline line ending

Author: jasonmccreary

src/Generators/ModelGenerator.php

@@ -243,7 +243,7 @@ private function addTraits(Model $model, $stub)
         }
 
         $stub = str_replace('use Illuminate\\Database\\Eloquent\\Model;', 'use Illuminate\\Database\\Eloquent\\Model;' . PHP_EOL . 'use Illuminate\\Database\\Eloquent\\SoftDeletes;', $stub);
-        $stub = preg_replace('/^\\{$/m', '{' . PHP_EOL . '    use SoftDeletes;' . PHP_EOL, $stub);
+        $stub = Str::replaceFirst('{', '{' . PHP_EOL . '    use SoftDeletes;' . PHP_EOL, $stub);
 
         return $stub;
     }