Handle better newlines in help message

[simplylizz]

Hello,

I want to add a list to help message, so each item should be on a new line. Now this looks not very good:

      --input          Possible values:
not set - read from stdin;
gs://<path to file gzipped file> - read from
                       GCS;
pubsub://projects/<project>/subscriptions/<subscription> - fetch input value
                       from PubSub

While the original help string looks like:

	Help: "Possible values:\n" +
		"not set - read from stdin;\n" +
		"gs://<path to file gzipped file> - read from GCS;\n" +
		"pubsub://projects/<project>/subscriptions/<subscription> - fetch input value from PubSub"

[akamensky]

Good suggestion. I don’t really have much time to work on this at the moment. But hopefully someone could help. This should be easily done by a few additions in a method that formats help message.