Fixes getTabs() in readme.html to work on IE 11

d.innerHTML returns `<li class="Tab" id="MoreTab" ...` on IE 11, while
the regex expects `<li id="MoreTab" ...` It seems like IE is changing
the order of the attributes within the tags.
Merge pull request #1798 from chtaube/docfix/ie

Make readme.html work on IE11. Fixes #1797