update socket.io development dependency to 1.2.1
update socket.io development dependency to 1.2.1

abhishekgahlot/ot.js,Operational-Transformation/ot.js,abhishekgahlot/ot.js,rike422/operatta-js,Operational-Transformation/ot.js,pingyuanChen/ot.js,pingyuanChen/ot.js,Operational-Transformation/ot.js,pingyuanChen/ot.js,abhishekgahlot/ot.js