Error when using dub

[Marc]

After some thinking i decided to create first a repository to 
play a little with mir ndslice library and then I plan to write a 
small article on its usage compared to numpy and pytorch. But I 
ran into a dub issue. I can't fetch the depencies or build the 
packages. The code is in https://github.com/istmarc/mir-examples. 
Can anyone please help with dub? I get the following error when 
running `dub fetch`
  `Error Invalid SemVer format: 1.39.0rc1.r78.0030b9af`.