add an option not to write query into output file

[NeoHuang]

currently the output file always contains the query as the first line. if the output file size is big, trim the first line will take another extra long time.

consider not write query by default into output file and use an option only when needed

[wellle]

@NeoHuang: Do you know about tail -n +2 result | jq ...?

[NeoHuang]

I know it. but if the file size is very large, even tail -n +2 will take long time.

[wellle]

But it doesn't make a difference. Observe for yourself:

head largefile

Is as instant as

tail -n +2 largefile | head

You don't need to wait for the tail to finish to work on its result.

[ferki]

There's a --header|--noheader|--no-header CLI option now. In the configuration file it can be specified as header:0|1.