fixed error raised in tutorial_IO notebook because of changes introduced by PR #756

Author: alixdamman

doc/source/tutorial/tutorial_IO.ipyml

@@ -523,7 +523,7 @@ cells:
 
 
 - code: |
-    read_hdf(filepath_hdf, key='deaths', sort_rows=True)
+    read_hdf(filepath_hdf, key='deaths').sort_axes()
 
 
 - markdown: |
@@ -728,7 +728,7 @@ metadata:
     name: python
     nbconvert_exporter: python
     pygments_lexer: ipython3
-    version: 3.6.8
+    version: 3.7.3
   livereveal:
     autolaunch: false
     scroll: true