Add etc/pygments/ dir with info on updating chapel lexer.
Try different link formatting...
Merge pull request #283 from thomasvandoren/pygments-dir

Add etc/pygments/ dir with info on updating chapel lexer.

Hopefully this will help devs remember to update pygments as the language changes.

Reviewer can see the html rendered version here: https://github.com/thomasvandoren/chapel/blob/master/etc/pygments/README.rst