Yarn/node version locking downstream issues

[LayneHaber]

When people install packages that consume counterfactual ones (e.g. some installs @connext/client) using a different yarn or node version, they get the error:

error @counterfactual/node@0.2.65: The engine "yarn" is incompatible with this module. Expected version "1.12.3". Got "1.17.3"
error @counterfactual/node@0.2.65: The engine "node" is incompatible with this module. Expected version "10.15.3". Got "11.10.1"

Should probably unlock the yarn/node versions to eliminate these downstream issues.

[dankins]

Steps to reproduce in a new directory:

npm init
yarn add @counterfactual/node

This only effects those using yarn, npm install works fine.

[ArjunBhuptani]

@dankins Did this work?^ Will close if so

[ArjunBhuptani]

Still an issue for people running node v12 (which is a LOT of people). @cf19drofxots any suggestions?

[ArjunBhuptani]

#2492 Should fix this