bug fixed

bug description:
1, environment: OS which default character is not 'UTF-8'. For example windows 10 which default character is 'gbk'.
2, operation:
python setup.py install
Traceback (most recent call last):
  File "setup.py", line 149, in <module>
    long_description=open("README.rst", "r").read(),
UnicodeDecodeError: 'gbk' codec can't decode byte 0xa2 in position 41: illegal multibyte sequence

Author: zwh

setup.py

@@ -147,7 +147,7 @@ def run(self):
     name="dvc",
     version=version,
     description="Git for data scientists - manage your code and data together",
-    long_description=open("README.rst", "r").read(),
+    long_description=open("README.rst", "r", encoding="UTF-8").read(),
     author="Dmitry Petrov",
     author_email="[email protected]",
     download_url="https://github.com/iterative/dvc",