Fix module name

Author: HansKimDWR

vtools/__init__.py

@@ -27,7 +27,7 @@
 from vtools.data.timeseries import *
 from vtools.data.dst import *
 
-from vtools.functions.ts_blend import *
+from vtools.functions.blend import *
 from vtools.functions.transition import *
 from vtools.functions.climatology import *
 from vtools.functions.interannual import *