remove support for deprecated options

- instagram.highlights
- metadata.bypost
- exec.final

gallery_dl/postprocessor/metadata.py

@@ -55,10 +55,6 @@ class MetadataPP(PostProcessor):
         events = options.get("event")
         if events is None:
             events = ("file",)
-            if options.get("bypost"):
-                self.log.warning("'bypost' is deprecated, use '\"event\": "
-                                 "\"post\"' and 'filename' instead")
-                events = ("metadata",)
         elif isinstance(events, str):
             events = events.split(",")
         for event in events: