Fix command line option for debugging swift module

Author: iT-Boyer

swift-mode-repl.el

@@ -280,7 +280,7 @@ Return a JSON object."
   (unless project-directory (setq project-directory default-directory))
   (swift-mode:call-process-to-json
    swift-mode:swift-package-executable
-   "--chdir" project-directory "describe" "--type" "json"))
+   "--package-path" project-directory "describe" "--type" "json"))
 
 (defun swift-mode:read-main-module (project-directory)
   "Read the main module description from the manifest file Package.swift.