Make serial into a namespace package.
diff --git a/serial/__init__.py b/serial/__init__.py
index c3cc154..3874193 100644
--- a/serial/__init__.py
+++ b/serial/__init__.py
@@ -9,6 +9,8 @@
import importlib
import sys
+from pkgutil import extend_path
+
from serial.serialutil import *
#~ SerialBase, SerialException, to_bytes, iterbytes
@@ -17,6 +19,9 @@
VERSION = __version__
+# serial is a namespace package
+__path__ = extend_path(__path__, __name__)
+
# pylint: disable=wrong-import-position
if sys.platform == 'cli':
from serial.serialcli import Serial