Bump the version to v0.4.28

Author: 1st1

setup.py

@@ -98,7 +98,7 @@ def build_extensions(self):
     author='Yury Selivanov',
     author_email='yury@magic.io',
     platforms=['*nix'],
-    version='0.4.27',
+    version='0.4.28',
     packages=['uvloop'],
     cmdclass={'build_ext': libuv_build_ext},
     ext_modules=[