“Floating point errors from Moment.js output” test fails in Chrome 68 and Firefox 61

[ticky]

Test in question: https://cdn.rawgit.com/jsmreese/moment-duration-format/0d6cfe10/test/test.html?testId=49cd728a

(This screenshot is Chrome, but the results are identical between both affected browsers)

Discovered while testing my branch for #120. Glad to confirm it wasn’t introduced by me! 😅