Re: Nim in CircleCI

[cdunn2001]

The `devel` branch plus full Nim build with caching works pretty well. But I'm 
disappointed that there is nothing quick. Even using **docker** with a released 
version of Nim takes about 40s, plus the time to start a VM. Maybe after 
`nim-1.0` we can ask TravisCI to include **nim** as a supported language.