Added correct link to cookbook for CSV read with epoch timestamps

Author: nipunbatra

doc/source/cookbook.rst

@@ -268,7 +268,7 @@ The :ref:`CSV <io.read_csv_table>` docs
 <https://github.com/pydata/pandas/issues/2886>`__
 
 `Reading CSV with Unix timestamps and converting to local timezone
-<http://nbviewer.ipython.org/5714493>` __
+<http://nbviewer.ipython.org/5714493>`__
 
 .. _cookbook.sql: