[Add] get_newest_bar_data in database.py [Add] get_newest_tick_data in database.py
[Add] get_newest_bar_data in database.py
[Add] get_newest_tick_data in database.py

bigdig/vnpy,bigdig/vnpy,andrewchenshx/vnpy,vnpy/vnpy,msincenselee/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,bigdig/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,bigdig/vnpy,andrewchenshx/vnpy,vnpy/vnpy,andrewchenshx/vnpy,msincenselee/vnpy