Update version in setup.py

Author: lmazuel

setup.py

@@ -28,7 +28,7 @@
 
 setup(
     name='msrest',
-    version='0.4.8',
+    version='0.4.9',
     author='Microsoft Corporation',
     packages=['msrest'],
     url=("https://github.com/Azure/msrest-for-python"),