bump angular version in README
bump angular version in README

dvdgs88/mydatepicker,kannanParamasivam/mydatepicker,jussikinnula/mydatepicker,dvdgs88/mydatepicker,kannanParamasivam/mydatepicker,jussikinnula/mydatepicker,jussikinnula/mydatepicker,dvdgs88/mydatepicker,kannanParamasivam/mydatepicker