adding .mjs config file and upgrading eslint plugins#79

bwang-icf merged 2 commits intomasterCMSgov/bluebutton-sample-client-nodejs-react:masterfrom

brandon/BB2-4035-manual-upgrade-lintersCMSgov/bluebutton-sample-client-nodejs-react:brandon/BB2-4035-manual-upgrade-lintersCopy head branch name to clipboard