Fixed long description (open-mmlab#16)

Author: xvjiarui

setup.py

@@ -3,13 +3,6 @@
 import time
 from setuptools import find_packages, setup
 
-
-def readme():
-    with open('README.md', encoding='utf-8') as f:
-        content = f.read()
-    return content
-
-
 version_file = 'mmseg/version.py'
 
 
@@ -167,7 +160,6 @@ def gen_packages_items():
         name='mmsegmentation',
         version=get_version(),
         description='Open MMLab Semantic Segmentation Toolbox and Benchmark',
-        long_description=readme(),
         author='MMSegmentation Authors',
         author_email='[email protected]',
         keywords='computer vision, semantic segmentation',