PEP561 compliance. Fixes #19

Author: Sylvain MARIE

mini_lambda/py.typed

@@ -149,9 +149,8 @@
     # If there are data files included in your packages that need to be
     # installed, specify them here.  If using Python 2.6 or less, then these
     # have to be included in MANIFEST.in as well.
-    # package_data={
-    #     'sample': ['package_data.dat'],
-    # },
+    # Note: we use the empty string so that this also works with submodules
+    package_data={"": ['py.typed', '*.pyi']},
 
     # Although 'package_data' is the preferred approach, in some case you may
     # need to place data files outside of your packages. See: