fix: Windows icon for windows build (#5)

* try to fix windows icon

* update spec

Author: finger563

images/icon.ico

@@ -39,4 +39,4 @@ exe = EXE(pyz,
           target_arch=None,
           codesign_identity=None,
           entitlements_file=None,
-          icon='./images/icon.ico')
+          icon='../images/icon.ico')