Add `--compat-options 2021,2022`

Use these to guard against future compat changes. This allows devs to
change defaults and make other potentially breaking changes more easily.
If you need everything to work exactly as-is, put this in your config

README.md

@@ -159,6 +159,8 @@ For ease of use, a few more compat options are available:
 * `--compat-options all`: Use all compat options (Do NOT use)
 * `--compat-options youtube-dl`: Same as `--compat-options all,-multistreams`
 * `--compat-options youtube-dlc`: Same as `--compat-options all,-no-live-chat,-no-youtube-channel-redirect`
+* `--compat-options 2021`: Same as `--compat-options 2022,no-certifi,filename-sanitization,no-youtube-prefer-utc-upload-date`
+* `--compat-options 2022`: Currently does nothing. Use this to enable all future compat options
 
 
 # INSTALLATION

yt_dlp/options.py

@@ -470,6 +470,8 @@ def create_parser():
             }, 'aliases': {
                 'youtube-dl': ['all', '-multistreams'],
                 'youtube-dlc': ['all', '-no-youtube-channel-redirect', '-no-live-chat'],
+                '2021': ['2022', 'no-certifi', 'filename-sanitization', 'no-youtube-prefer-utc-upload-date'],
+                '2022': [],
             }
         }, help=(
             'Options that can help keep compatibility with youtube-dl or youtube-dlc '