[1.3.1] - 2019-02-13

Changed

• Composer: fix #13, user scrolling in Firefox may have the scroll position locked occasionally, in PR #12
• SpineTo: fix #10, set stopping threshold from 0.5 to 1.5, in PR #14
• Composer: fix #15, set near-end threshold from 0 to (less than) 1, in PR #16