Fix `--version` output

As noted by @DanaEpp in #217, `--version` is outputting the wrong
version number. This is due to it passing the old package name to
``importlib.metadata.version()``. This actually causes an unhandled
exception if you don't also have the `pwncat` package installed.

pwncat/__main__.py

@@ -101,7 +101,7 @@ def main():
 
     # Print the version number and exit.
     if args.version:
-        print(importlib.metadata.version("pwncat"))
+        print(importlib.metadata.version("pwncat-cs"))
         return
 
     # Create the session manager