Declare type checking support by including py.typed, as per PEP 561 (#9)

Author: squahtx

matrix_common/py.typed

@@ -8,6 +8,7 @@ version = 1.0.0
 classifiers =
   License :: OSI Approved :: Apache Software License
 
+
 [options]
 packages =
   matrix_common
@@ -16,6 +17,10 @@ install_requires =
   attrs
 
 
+[options.package_data]
+matrix_common = py.typed
+
+
 [options.extras_require]
 dev =
   # for tests