forked from VimPlug/jedi-vim
It was removed previously, since it now refers to the environment being used. This brings it back for now. There could be a separate var for it later, and/or it needs changes later (or rather the environment needs a new variable name, since it should refer to the executable really) - but this is good for now I think. Fixes https://github.com/davidhalter/jedi-vim/issues/833