Update CodeMirror license
Update CodeMirror license

Update the LICENSE for CodeMirror. The current one is very
outdated. The new one is taken verbatim from:
https://github.com/codemirror/CodeMirror/blob/8850e2684113e18b543bd1c43a3920238e8c7f69/LICENSE.

Change-Id: I9bd9850a6efa54e31835334049bba003b2dde4be

gerrit-review/gerrit,MerritCR/merrit,qtproject/qtqa-gerrit,joshuawilson/merrit,WANdisco/gerrit,MerritCR/merrit,qtproject/qtqa-gerrit,joshuawilson/merrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,joshuawilson/merrit,gerrit-review/gerrit,WANdisco/gerrit,gerrit-review/gerrit,MerritCR/merrit,qtproject/qtqa-gerrit,MerritCR/merrit,joshuawilson/merrit,gerrit-review/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,MerritCR/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,gerrit-review/gerrit,WANdisco/gerrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,WANdisco/gerrit,WANdisco/gerrit,MerritCR/merrit,joshuawilson/merrit