Update dependencies.
Update uglify-js to v2.4.15.
Run `grunt`.
Fix text on ".progress-bar .sr-only" elements.
Merge pull request #14112 from vsn4ik/fix-sr-only-progress-bars

Fix text on ".progress-bar .sr-only" elements in docs
dropdowns.html: Add role="button" and id="..." to link in example.
Merge pull request #14113 from vsn4ik/add-attributes-for-dropdown-example

dropdowns.html: Add role="button" and id="..." to link in example.
Gruntfile.js: Add semicolon in "_update-shrinkwrap" task.
Merge pull request #14118 from vsn4ik/add-semicolon-in-gruntfile

Gruntfile.js: Add semicolon in "_update-shrinkwrap" task.
Gruntfile-specific JSHint config: disable ASI

Refs #14118