Feature request: Add fields to warcinfo

[BubuAnabelas]

The spec says:

Allowable fields include, but are not limited to...

Currently it just admits the isPartOf, UserAgent and description. It would be useful to add software-based fields, to change the robots fields and to add some extra info to the software line.

node-warc/lib/writers/warcFields.js

Lines 175 to 189 in 09a8a0b

	function warcInfoContent ({ version, isPartOfV, warcInfoDescription, ua }) {
	const base = [
	`software: node-warc/${version}${CRLF}format: WARC File Format ${WARCV}${CRLF}robots: ignore${CRLF}`
	]
	if (isPartOfV != null) {
	base.push(`isPartOf: ${isPartOfV}${CRLF}`)
	}
	if (warcInfoDescription != null) {
	base.push(`description: ${warcInfoDescription}${CRLF}`)
	}
	if (ua != null) {
	base.push(`http-header-user-agent: ${ua}${CRLF}`)
	}
	return base.join('')
	}

[BubuAnabelas]

Tested commit 0de56e6 and everything seems to work fine, feature added.
Closing issue.