Really actually fix installing stubs with the package.

Author: irgeek

MANIFEST.in

@@ -1,5 +1,3 @@
-include strenum/*.pyi
-include strenum/*.typed
 include versioneer.py
 include strenum/_version.py
 exclude tests/*

setup.py

@@ -16,6 +16,7 @@
     long_description_content_type="text/markdown",
     url="https://github.com/irgeek/StrEnum",
     packages=["strenum"],
+    package_data={"strenum": ["*.typed", "*.pyi"]},
     extras_require={
         "test": [
             "pytest",