fixed bug for missing holiday on 2018-12-31

Author: wegamekinglc

PyFin/DateUtilities/Calendar.pyx

@@ -434,6 +434,7 @@ cdef set sse_holDays = {Date(2005, 1, 3),
                         Date(2018, 10, 3),
                         Date(2018, 10, 4),
                         Date(2018, 10, 5),
+                        Date(2018, 12, 31),
                         Date(2019, 1, 1),
                         Date(2019, 2, 4),
                         Date(2019, 2, 5),

PyFin/tests/DateUtilities/testCalendar.py

@@ -105,6 +105,7 @@ def testChinaSSE(self):
                        Date(2018, 6, 16), Date(2018, 6, 17), Date(2018, 6, 18),
                        Date(2018, 9, 22), Date(2018, 9, 23), Date(2018, 9, 24),
                        Date(2018, 10, 1), Date(2018, 10, 2), Date(2018, 10, 3), Date(2018, 10, 4), Date(2018, 10, 5), Date(2018, 10, 6), Date(2018, 10, 7),
+                       Date(2018, 12, 31),
         # China Shanghai Securities Exchange holiday list in the year 2019
                        Date(2019, 1, 1),
                        Date(2019, 2, 4), Date(2019, 2, 5), Date(2019, 2, 6), Date(2019, 2, 7), Date(2019, 2, 8),