fix(package.json): use github dep for eslint-config-dcos
fix(package.json): use github dep for eslint-config-dcos

The package eslint-config-dcos is not on npm. So we can't use plain version.
It went undetected because `npm install` relies on npm-shrinkwrap.json

Introduced https://github.com/dcos/dcos-ui/commit/d7e679f3df5a69621d71d9baac5f92d50e4b45e8#diff-b9cfc7f2cdf78a7f4b91a753d10865a2L88

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui