fix long_description with readme

setup.py

@@ -1,20 +1,23 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 from setuptools import setup, find_packages
+from os import path
 
-with open('README.md', 'r') as fh:
-    long_description = fh.read()
+
+this_directory = path.abspath(path.dirname(__file__))
+with open(path.join(this_directory, 'README.md')) as f:
+    long_description = f.read()
 
 setup(
     name='monkeylearn',
-    version='3.2.3',
+    version='3.2.4',
     author='MonkeyLearn',
     author_email='[email protected]',
     description='Official Python client for the MonkeyLearn API',
     long_description=long_description,
     long_description_content_type="text/markdown",
     url='https://github.com/monkeylearn/monkeylearn-python',
-    download_url='https://github.com/monkeylearn/monkeylearn-python/tarball/v3.2.3',
+    download_url='https://github.com/monkeylearn/monkeylearn-python/tarball/v3.2.4',
     keywords=['monkeylearn', 'machine learning', 'python'],
     classifiers=[
         'Development Status :: 5 - Production/Stable',