nvm use stable uses a node that's incompatible with the packages

[squeedee]

1. nvm install stable installs 13.5.0
2. using that nvm, the npm install fails on grpc@1.23.3 install
3. I tried nvm install 12.14.0 (and then use default) and now npm install works well.

I did this because the top of the readme suggests using LTS - and that works well.

[ooloth]

v12.6.0 works as well.