Finds highlighters dir a little better
a more simple and universal way (for zsh projects) to find highlight dir path
Merge pull request #110 from xaocon/master

small change to find highlighting directory better
#110: Now using :A modifier, bump zsh version requirement
Update README.md

Edited links to Archlinux packages (the link to `zsh-syntax-highlighting-git` is out-of-date, and `zsh-syntax-highlighting` is now available in [community])
Merge pull request #135 from arcan1s/patch-1

Update README.md