Include typing information during packaging (#579)

* Include typing information during packaging

* Update CHANGELOG for #579

* Fix `package_data`

Author: cuttlefish

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## [Unreleased]
 
 ### Added
+- Include type information during packaging for use with e.g. `mypy` ([#579](https://github.com/stac-utils/pystac/pull/579))
 - Optional `dest_href` argument to `Catalog.save` to allow saving `Catalog` instances to
   locations other than their `self` href ([#565](https://github.com/stac-utils/pystac/pull/565))
 

pystac/py.typed

@@ -20,8 +20,8 @@
     author_email="stac@radiant.earth",
     url="https://github.com/stac-utils/pystac",
     packages=find_packages(),
+    package_data={"": ["py.typed"]},
     py_modules=[splitext(basename(path))[0] for path in glob("pystac/*.py")],
-    include_package_data=False,
     python_requires=">=3.7",
     install_requires=[
         "python-dateutil>=2.7.0",