`jz outdated --json` emits invalid json

[mike-kaufman]

running jz outdated --json emits output that is not valid json.

In particular,

• the list of entries are not wrapped in [ and ] at the head and tail of the outpu
• the list of entries are not delimited by commas.

See code here:

jazelle/commands/outdated.js

Lines 160 to 182 in c2e9658

	for (const result of results) {
	const formatted = [];
	if (dedup) {
	formatted.push(result);
	} else {
	result.installed.forEach(version =>
	formatted.push({
	...result,
	installed: [version],
	})
	);
	}
	if (json) logger('[');
	formatted.forEach((entry, i) =>
	json
	? logger(
	JSON.stringify(entry) + (i !== formatted.length - 1 ? ',' : '')
	)
	: logger(entry.packageName, entry.installed.join(' '), entry.latest)
	);
	if (json) logger(']');
	}