fixes #13816 Modal dialog closes when dragging and releasing mouse button outside dialog
Merge pull request #14724 from twbs/fat-13816

fixes #13816 Modal dialog closes when dragging and releasing mouse button outside dialog
grunt
Update JSZip to v2.4.0.

[ci skip]
Update Holder.js to v2.4.0.

[ci skip]
Run `grunt`.

[ci skip]