optional period (#59)

Author: tlambert03

tox_conda/plugin.py

@@ -20,7 +20,7 @@ class CondaDepOption(DepOption):
 
 def get_py_version(envconfig, action):
     # Try to use basepython
-    match = re.match(r"python(\d)(?:\.(\d))?(?:\.(\d))?", envconfig.basepython)
+    match = re.match(r"python(\d)(?:\.(\d))?(?:\.?(\d))?", envconfig.basepython)
     if match:
         groups = match.groups()
         version = groups[0]