doc: Update HISTORY section for match string highlighting
doc: Update HISTORY section for match string highlighting

I'm not yet sure whether this feature will get merged into master, nor
whether it should be on by default or whether it should be configurable,
so for now not mentioning it outside of the HISTORY section.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

vrkansagara/command-t,tmeusburger/Command-T,tmeusburger/Command-T,supriyantomaftuh/command-t,supriyantomaftuh/command-t,lencioni/command-t,simichaels/dotfiles,nkpart/command-t,mtimkovich/command-t,tmeusburger/Command-T,simichaels/dotfiles,wincent/command-t,besarthoxhaj/command-t,nkpart/command-t,nkpart/command-t,vrkansagara/command-t,besarthoxhaj/command-t,wincent/command-t,wincent/command-t,yrro/command-t,1234-/command-t,mtimkovich/command-t,lencioni/command-t,1234-/command-t,yrro/command-t