zulip_bots, zulip_botserver: Add PEP 561 type annotation markers.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

zulip_bots/setup.py

@@ -15,7 +15,8 @@ IS_PYPA_PACKAGE = False
 
 
 package_data = {
-    '': ['doc.md', '*.conf', 'assets/*']
+    '': ['doc.md', '*.conf', 'assets/*'],
+    'zulip_bots': ['py.typed'],
 }
 
 # IS_PYPA_PACKAGE is set to True by tools/release-packages

zulip_botserver/setup.py

@@ -30,6 +30,7 @@ package_info = dict(
         ],
     },
     test_suite='tests',
+    package_data={'zulip_botserver': ['py.typed']},
 )  # type: Dict[str, Any]
 
 setuptools_info = dict(