don't strictly require pipdate

Author: nschloe

matplotlib2tikz/__init__.py

@@ -17,6 +17,10 @@
 
 from matplotlib2tikz.save import get_tikz_code, save
 
-import pipdated
-if pipdated.needs_checking(__name__):
-    print(pipdated.check(__name__, __version__))
+try:
+    import pipdate
+except ImportError:
+    pass
+else:
+    if pipdate.needs_checking(__name__):
+        print(pipdate.check(__name__, __version__))

setup.py

@@ -34,7 +34,7 @@ def read(fname):
         'matplotlib >=1.4.0',
         'numpy',
         'Pillow >= 3.0.0',
-        'pipdated',
+        'pipdate',
         'six',
         ],
     description='convert matplotlib figures into TikZ/PGFPlots',