ezodf API changed from sheet to sheets

Author: davidovitch

pandas/io/excel.py

@@ -703,7 +703,7 @@ def _print_ods_cellinfo(self, cell):
     def sheet_names(self):
         if self.engine == 'ezodf':
             # book.sheet.names() is a generator for ezodf
-            return [sheetname for sheetname in self.book.sheet.names()]
+            return [sheetname for sheetname in self.book.sheets.names()]
         else:
             return self.book.sheet_names()