fix argparse version check

IPython/external/argparse/__init__.py

@@ -1,11 +1,12 b''
+from IPython.utils.version import check_version
 try:
     import argparse
     # don't use system argparse if older than 1.1:
-    if argparse.__version__ < '1.1':
+    if not check_version(argparse.__version__, '1.1'):
         raise ImportError
     else:
         from argparse import *
         from argparse import SUPPRESS
 except (ImportError, AttributeError):
     from _argparse import *
     from _argparse import SUPPRESS