update version (#71)

* update CHANGELOG

* update version
Co-authored-by: Nhuawei <huawei@bit-s.cn>
Co-authored-by: Nkezhenxu94 <kezhenxu94@apache.org>

setup.py

@@ -25,7 +25,7 @@ README = (HERE / "README.md").read_text()
 
 setup(
     name="apache-skywalking",
-    version="0.2.0",
+    version="0.3.0",
     description="Python Agent for Apache SkyWalking",
     long_description=README,
     long_description_content_type="text/markdown",
@@ -39,6 +39,7 @@ setup(
         "grpcio",
         "grpcio-tools",
         "requests",
+        "packaging",
     ],
     extras_require={
         "test": [