Add default version tag to setup.py

setup.py

@@ -1,10 +1,15 @@
 import os
+from re import match
+
 from setuptools import find_packages
 from setuptools import setup
 
+tag = os.popen('git describe').read()
+version = '0.0.0' if match(r"v[\d\.]+", tag) is None else tag[1:]
+
 setup(
     name='mpr',
-    version=os.popen('git describe').read()[1:],
+    version=version,
     author='Andrew Kirkegaard',
     author_email='andrew.kirkegaard@gmail.com',
     url='https://github.com/gumballhead/mpr',
@@ -24,7 +29,7 @@
         'aiohttp >3.6, <4.0', 
         'numpy >1.15.0, <1.19.0', 
         'pandas >1.0.0, <1.1.0', 
-        'isoweek >1.3.0, <1.4.0', 
+        'python-dateutil >2.8.0, <2.9.0',
         'pytz==2019.3'
     ],
     setup_requires=['wheel'])