Cannot create .cache file
Related to the recent issue of https://github.com/SpaceVim/SpaceVim/pull/4409.

After fresh install on macos seeing the following error:
```
➜  ~ vim
Error detected while processing function SpaceVim#custom#load:
line   16:
E482: Can't create file /Users/<user>/.cache/SpaceVim/conf/_Users_<user>__SpaceVim_d_init_toml.json
Press ENTER or type command to continue
```

Problem here is that the `conf` directory does not exists. 

I was able to bypass this error by manually creating the `.cache/SpaceVim/conf` directory.