Feature Request: Remove Trailing space on truncation

[donaldwasserman]

Hello -

I've come across a needed feature (at least for me) is that when truncating text that falls on a space, I'd like to able to pass in a flag that strips the trailing space before appending the ellipsis,

{{truncate "my string here" 3 true true}}

or via options object

{{truncate "my string here" 3 true trim=true}}

I'd be happy to implement it.