fixed version parsing

setup.py

@@ -5,36 +5,37 @@
 """
 import io
 import os
+
 try:
     from setuptools import setup
 except ImportError:
     from distutils.core import setup
 
-with io.open('requirements.txt') as f:
+with io.open("requirements.txt") as f:
     required = f.read().splitlines()
 
-with io.open('Readme.md', encoding='utf-8') as f:
+with io.open("Readme.md", encoding="utf-8") as f:
     long_description = f.read()
 
 # Handle version number with optional .dev postfix when building a develop branch
 # on AppVeyor.
-VERSION = io.open('motmetrics/__init__.py').readlines()[-1].split()[-1].strip('\'')
-BUILD_NUMBER = os.environ.get('APPVEYOR_BUILD_NUMBER', None)
-BRANCH_NAME = os.environ.get('APPVEYOR_REPO_BRANCH', 'develop')
-if BUILD_NUMBER is not None and BRANCH_NAME != 'master':
-    VERSION = '{}.dev{}'.format(VERSION, BUILD_NUMBER)
+VERSION = io.open("motmetrics/__init__.py").readlines()[-1].split()[-1].strip('"')
+BUILD_NUMBER = os.environ.get("APPVEYOR_BUILD_NUMBER", None)
+BRANCH_NAME = os.environ.get("APPVEYOR_REPO_BRANCH", "develop")
+if BUILD_NUMBER is not None and BRANCH_NAME != "master":
+    VERSION = "{}.dev{}".format(VERSION, BUILD_NUMBER)
 
 setup(
-    name='motmetrics',
+    name="motmetrics",
     version=VERSION,
-    description='Metrics for multiple object tracker benchmarking.',
-    author='Christoph Heindl, Jack Valmadre',
-    url='https://github.com/cheind/py-motmetrics',
-    license='MIT',
+    description="Metrics for multiple object tracker benchmarking.",
+    author="Christoph Heindl, Jack Valmadre",
+    url="https://github.com/cheind/py-motmetrics",
+    license="MIT",
     install_requires=required,
-    packages=['motmetrics', 'motmetrics.tests', 'motmetrics.apps'],
+    packages=["motmetrics", "motmetrics.tests", "motmetrics.apps"],
     include_package_data=True,
-    keywords='tracker MOT evaluation metrics compare',
+    keywords="tracker MOT evaluation metrics compare",
     long_description=long_description,
-    long_description_content_type='text/markdown',
+    long_description_content_type="text/markdown",
 )