Add NPM badge to README
Add NPM badge to README
abhishekgahlot/ot.js,abhishekgahlot/ot.js,pingyuanChen/ot.js,rike422/operatta-js,pingyuanChen/ot.js,Operational-Transformation/ot.js,pingyuanChen/ot.js,Operational-Transformation/ot.js,Operational-Transformation/ot.js,abhishekgahlot/ot.js