I pulled from git master and compiled on linux. If not yet there, it should be in the next nightly build.
Edit:
2019-03-11T23:37:50.290Z 898.9 MB kicad-r12510.c61ec8ee3-x86_64.exe
This is 5.1.0-9-gc61ec8ee3. The version number scheme was changed when v6 development started. It’s a bit better than 6.0-…, at least it doesn’t give impression of v6 which is probably some years in the future. Personally I would prefer 5.1.0+n…, it would be a bit clearer, or maybe 5.2 (which would then be reserved only for development).