README: Fix .mailmap link markup
authorW. Trevor King <wking@tremily.us>
Mon, 27 Jan 2014 17:14:20 +0000 (09:14 -0800)
committerW. Trevor King <wking@tremily.us>
Mon, 27 Jan 2014 17:14:20 +0000 (09:14 -0800)
commit53d068c934b9b5496df3341dee911d6e792d0395
tree857baeeb93aa125a7c343ffbcdf14aa888479ebe
parentae8a4cff9f5cf59f362ef7f263c500d1070c52df
README: Fix .mailmap link markup

Apparently reStructuredText needs backticks here.  Maybe the leading
dot confuses it.
README