This is a bug fix release, addressing an issue with crossfade transitions related to fade.initial and fade.final. See #1009 for more details.
The binary code is not changed in this release, only the definitions for those two operators, located in the libs/fades.liq file. It is, then, also possible to simply update this one file and keep an installed 1.4.0 release.
Finally, the arguments of the two operators have been changed. This is technically breaking the script API but we believe it should not affect most of our users.
Feel free to drop us a message on the Slack channel or at savonet-users@lists.sourceforge.net