Add support for leading/trailing option for throttle and debounce.

[Biohazord]

Would you be interested in a PR to add an additional prop for the leading/trailing options for Lodash's throttle/debounce function? If yes, I can whip something up.

[maslianok]

Hi @Biohazord
Thanks for the suggestion!

Deployed in v3.3.1
Added refreshOptions prop:

{ leading: bool, trailing: bool }