add common resolutions to screenshot

src/cogs/screenshot.py

@@ -112,6 +112,18 @@ class ScreenshotCog(commands.Cog):
             )
             driver.set_page_load_timeout(load_timeout)
             if resolution:
+                common = {
+                    "8k": "7680x4320",
+                    "4k": "3840x2160",
+                    "1440p": "2560x1440",
+                    "1080p": "1920x1080",
+                    "720p": "1280x720",
+                    "480p": "854x480",
+                    "360p": "640x360",
+                    "240p": "426x240",
+                    "144p": "256x144"
+                }
+                resolution = common.get(resolution.lower(), resolution)
                 try:
                     width, height = map(int, resolution.split("x"))
                     driver.set_window_size(width, height)