fix(image): now save method will return path string instead of the Pa…

…th object (as documented)

src/gemini_webapi/types/image.py

@@ -98,7 +98,7 @@ async def save(
                 if verbose:
                     logger.info(f"Image saved as {dest.resolve()}")
 
-                return dest.resolve()
+                return str(dest.resolve())
             else:
                 raise HTTPError(
                     f"Error downloading image: {response.status_code} {response.reason_phrase}"