Fixed two memory leaks where timedelta objects were not being cleaned (#51)
Fixed two memory leaks where timedelta objects were not being cleaned (#51)

* Fixed two memory leaks where timedelta objects were not being cleaned up.

- Fixed a memory leak in Python 3.7 parsing of timestamps with timezone information.
- Fixed a memory leak in the special midnight case.
closeio/ciso8601,closeio/ciso8601,closeio/ciso8601,elasticsales/ciso8601,elasticsales/ciso8601