README: backquote some text in changes list for 1.1.12
treebab0b80d93c2a48a2abe3655a22af99b0c4df9eb
-rw-r--r-- 1526 LICENSE
-rwxr-xr-x 173107 Markdown.pl
lrwxrwxrwx 11 Markdown.pm -> Markdown.pl
-rw-r--r-- 17268 README
lrwxrwxrwx 6 README.md -> README
-rw-r--r-- 9672 basics.md
-rw-r--r-- 50193 syntax.md