use data-role instead of role until validator is fixed

[eshellman]

ppmath/bin/index.js

Line 38 in 0c32d0a

txt = txt.replace(/role=".*?"/, "");

[70ray]

The next version of m2svg will use MathJax verssion 4. This page removes 'role' before creating the image. Do you want to change it to data-role instead?

[eshellman]

what's the context? ISTR some issue where the validatator wasn't implementing the spec correctly? Is this related?

[eshellman]

... reading title... oh yes, should check if validator is fixed!