Added py.typed to signal that we support type annotations for PEP-561. Fixes #1036

Author: anselor

cmd2/py.typed

@@ -0,0 +1 @@
+# PEP 561

plugins/ext_test/cmd2_ext_test/py.typed

@@ -0,0 +1 @@
+# PEP 561

plugins/ext_test/setup.py

@@ -16,6 +16,10 @@
     'git_describe_command': 'git describe --dirty --tags --long --match "plugin-ext-test*"',
 }
 
+PACKAGE_DATA = {
+    'cmd2_ext_test': ['py.typed'],
+}
+
 setuptools.setup(
     name='cmd2-ext-test',
     version=scm_version,
@@ -30,6 +34,7 @@
     url='https://github.com/python-cmd2/cmd2/tree/master/plugins/ext_test',
     license='MIT',
 
+    package_data=PACKAGE_DATA,
     packages=['cmd2_ext_test'],
 
     python_requires='>=3.5',

setup.py

@@ -70,6 +70,10 @@
             ]
 }
 
+PACKAGE_DATA = {
+    'cmd2': ['py.typed'],
+}
+
 setup(
     name="cmd2",
     use_scm_version={
@@ -84,6 +88,7 @@
     url='https://github.com/python-cmd2/cmd2',
     license='MIT',
     platforms=['any'],
+    package_data=PACKAGE_DATA,
     packages=['cmd2'],
     keywords='command prompt console cmd',
     python_requires='>=3.5',