allow package name override in new

Author: gilesknap

src/dls_python3_skeleton/__main__.py

@@ -127,7 +127,7 @@ def replace_text(text: str) -> str:
 def new(args):
     path: Path = args.path
 
-    package = path.name
+    package = args.package or path.name
     valid = VALID_PKG.match(package)
     assert valid, f"'{package}' is not a valid python package name"