feat: add version flag

src/caelestia/__init__.py

@@ -1,9 +1,12 @@
 from caelestia.parser import parse_args
+from caelestia.utils.version import print_version
 
 
 def main() -> None:
     parser, args = parse_args()
-    if "cls" in args:
+    if args.version:
+        print_version()
+    elif "cls" in args:
         args.cls(args).run()
     else:
         parser.print_help()