1. remove python 2 support

2. add async client example to README
3. add test_async to docker-compose command

Author: Swind-Ou

README.rst

@@ -30,7 +30,7 @@ This package supports most of the adb command line tool's functionality.
 Requirements
 ============
 
-Python 2.7+ / Python 3.6+
+Python 3.6+
 
 Installation
 ============
@@ -197,6 +197,38 @@ Enable debug logger
 
     logging.getLogger("ppadb").setLevel(logging.DEBUG)
 
+Async Client
+--------------------
+
+.. code-block:: python
+
+    import asyncio
+    import aiofiles
+    from ppadb.client_async import ClientAsync as AdbClient
+
+    async def _save_screenshot(device):
+        result = await device.screencap()
+        file_name = f"{device.serial}.png"
+        async with aiofiles.open(f"{file_name}", mode='wb') as f:
+            await f.write(result)
+
+        return file_name
+
+    async def main():
+        client = AdbClient(host="127.0.0.1", port=5037)
+        devices = await client.devices()
+        for device in devices:
+            print(device.serial)
+
+        result = await asyncio.gather(*[_save_screenshot(device) for device in devices])
+        print(result)
+
+    asyncio.run(main())
+
+
+
+
+
 
 How to run test cases
 ======================

docker-compose.yaml

@@ -10,7 +10,7 @@ services:
     environment:
      - PYTHONPATH=/code
      - PYTHONUNBUFFERED=0
-    command: sh -c "pip install -r requirements.txt;py.test test -s -v --junit-xml test_result.xml"
+    command: sh -c "pip install -r requirements.txt;py.test test -s -v --junit-xml test_result.xml;pip install 'aiofiles>=0.4.0';py.test test_async -s -v --junit-xml test_result_async.xml"
 
   emulator:
     image: swind/android-emulator:android_28

setup.py

@@ -16,7 +16,6 @@
     'Intended Audience :: Developers',
     'License :: OSI Approved :: MIT License',
     'Programming Language :: Python :: 3',
-    'Programming Language :: Python :: 2.7',
     'Topic :: Software Development :: Testing',
 ]