Fix class name

mrkn · mrkn · commit 3fbf41e1e922 · 2017-03-03T12:52:37.000+09:00
diff --git a/lib/matplotlib/axes.rb b/lib/matplotlib/axes.rb
@@ -1,5 +1,5 @@
 module Matplotlib
-  class Axes3D
+  class Axes
     include PyCall::PyObjectWrapper
 
     @__pyobj__ = PyCall.import_module('matplotlib.axes').Axes
