Vim: update Command-T

Want to battle-test recent changes before cutting a release.

  * .vim/bundle/command-t b5868e2...0dda670 (8):
    > Doc: update HISTORY section
    > Establish new benchmark baseline
    > Fix memoization
    > Fix off-by-one error in last_idx management
    > Fix egregious matching bug
    > Add <ESC> key xterm info to FAQ
    > Add casts to silence Clang warnings
    > Fix compiler warnings on CentOS

Signed-off-by: Greg Hurrell <greg@hurrell.net>