fix back-compat for < 0.13

Author: jreback

pandas/compat/pickle_compat.py

@@ -58,7 +58,10 @@ def load_reduce(self):
 
     # 15477
     ('pandas.core.base', 'FrozenNDArray'): ('pandas.indexes.frozen', 'FrozenNDArray'),
-    ('pandas.core.base', 'FrozenList'): ('pandas.indexes.frozen', 'FrozenList')
+    ('pandas.core.base', 'FrozenList'): ('pandas.indexes.frozen', 'FrozenList'),
+
+    # 10890
+    ('pandas.core.series', 'TimeSeries'): ('pandas.core.series', 'Series')
     }