Twenty Seventeen: Update jQuery scrollTo to the latest version

[desrosj]

The scrollTo jQuery plugin is included in Twenty Seventeen, currently at version 2.1.2. Version ​2.1.3 is now available, so this should be updated.

In 2.1.3, jQuery.isFunction is removed since it has been deprecated.

​A full list of changes can be found on GitHub.

Trac ticket: https://core.trac.wordpress.org/ticket/56702
Updating scrollTo jQuery plugin included in Twenty Seventeen, from version 2.1.2 to version ​2.1.3.

Testing Note:
In 2.1.3, jQuery.isFunction is removed since it has been deprecated.
​A full list of changes can be found on GitHub.

[desrosj]

Added review notes on the PR.

Thanks @desrosj! The reason for the excessive changes is actually that we don't seem to have a true copy of 2.1.2. If you checkout before commit ​18fb646 and compare our version to the file in ​jquery.scrollTo/releases/tag/2.1.2 and run a diff, there is quite a difference. ☹️

As such, we should probably do some extra testing to be sure other stuff isn't breaking. But, it's probably good to get the true version in there - what do you think?

I'll work on updating the version specified in the wp_enqueue_script() call in functions.php in the meantime. Thanks for the catch!

[mukesh27]

Thanks @sarahricker

​PR #3381 looks good. Need final review from @desrosj

[desrosj]

In 54374:

Twenty Seventeen: Update the scrollTo jQuery plugin.

This updates the scrollTo jQuery plugin included in Twenty Seventeen to the latest version, 2.1.3.

For a full list of changes in this update, see GitHub: ​https://github.com/flesler/jquery.scrollTo/compare/2.1.2...v2.1.3.

Props sarahricker, mukesh27, desrosj.
Fixes #56702.

Merged in https://core.trac.wordpress.org/changeset/54374.

Awesome, thanks!