They don't do a very good job at keeping linked to the latest version, so it
only looks like nothing is going on. Timeline shows the 1.3.4 release
announcement but didn't seem to make it to the release section yet. jxself
has already posted the URL to 1.3.4 binaries.
If you wanted more control and greater customization, just follow their
simple guide for compiling it yourself...
https://librecmc.org/librecmc/wiki?name=Build+HOWTO
Super easy to do. And it allows you to compile in useful things like SQM and
BCP38 that are not in their prebuilt images.
Only at the part where it says...
fossil open ../librecmc.fossil v1.3.x
...do this instead...
fossil open ../librecmc.fossil v1.3.4
...or you will end up compiling 1.3 trunk instead of 1.3.4.
I compiled 1.3.4 a day after its release and have been running it on two
WNDR3800 units. Zero issues. I absolutely love libreCMC. So much cleaner
than openWRT and no blobs.