Add helper function that allows user to stream virtual operations
Virtual operations are only present in the 'irreversible' blocks.
Example helper function that needs to be adapted to use proper callbacks:
var hive = require('@hiveio/hive-js')
hive.api.streamBlockNumber('irreversible', function (err, blockNum) {
hive.api.getOpsInBlock(blockNum, true, (err, res) => {
console.log(err, res)
})
});