uasyncio: Update for rename microsocket -> usocket.

uasyncio/metadata.txt

@@ -1,6 +1,6 @@
 srctype = micropython-lib
 type = module
-version = 0.6
+version = 0.6.1
 author = Paul Sokolovsky
 long_desc = Lightweight asyncio-like library built around native Python coroutines, not around un-Python devices like callback mess.
 depends = heapq, errno, select, logging

uasyncio/setup.py

@@ -6,7 +6,7 @@ from setuptools import setup
 
 
 setup(name='micropython-uasyncio',
-      version='0.6',
+      version='0.6.1',
       description='uasyncio module for MicroPython',
       long_description='Lightweight asyncio-like library built around native Python coroutines, not around un-Python devices like callback mess.',
       url='https://github.com/micropython/micropython/issues/405',

uasyncio/uasyncio.py

@@ -179,7 +179,7 @@ def sleep(secs):
     yield Sleep(secs)
 
 
-import microsocket as _socket
+import usocket as _socket
 
 class StreamReader: