Bump version to v0.5.3

Author: Yury Selivanov

setup.py

@@ -100,7 +100,7 @@ def build_extensions(self):
     author='Yury Selivanov',
     author_email='yury@magic.io',
     platforms=['*nix'],
-    version='0.5.2',
+    version='0.5.3',
     packages=['uvloop'],
     cmdclass={'build_ext': libuv_build_ext},
     ext_modules=[