[update] setup.py, change version number

Author: Yunfan Shao

setup.py

@@ -16,7 +16,7 @@
 
 setup(
     name='FastNLP',
-    version='0.4.10',
+    version='0.5.0',
     url='https://github.com/fastnlp/fastNLP',
     description='fastNLP: Deep Learning Toolkit for NLP, developed by Fudan FastNLP Team',
     long_description=readme,