[MINOR][BUILD] Add modernizr MIT license; specify "2014 and onwards" in license copyright

## What changes were proposed in this pull request?

Per conversation on dev list, add missing modernizr license.
Specify "2014 and onwards" in copyright statement.

## How was this patch tested?

(none required)

Author: Sean Owen <sowen@cloudera.com>

Closes #13510 from srowen/ModernizrLicense.