Fix reflection of TIMESTAMPTZ columns

Author: nvachhar

sqlalchemy_cockroachdb/base.py

@@ -45,8 +45,8 @@
     "time": sqltypes.Time,
     "time without time zone": sqltypes.Time,
     "timestamp": sqltypes.TIMESTAMP,
-    "timestamptz": sqltypes.TIMESTAMP,
-    "timestamp with time zone": sqltypes.TIMESTAMP,
+    "timestamptz": sqltypes.TIMESTAMP(timezone=True),
+    "timestamp with time zone": sqltypes.TIMESTAMP(timezone=True),
     "timestamp without time zone": sqltypes.TIMESTAMP,
     "interval": sqltypes.Interval,
     "char": sqltypes.CHAR,