Issue: new lines with extra character

[areYouLazy]

Describe the bug
Lines added by this library has an extra \t character you can see in hosty output as described here: areYouLazy/hosty#2

To Reproduce
Steps to reproduce the behavior:

1. Add a line with this library (or use hosty
2. Add a new line by hand
3. Print lines to CLI to show the extra \t character

Expected behavior
New lines should not add extra characters, also considering we can't have lines with infinite length

[areYouLazy]

Example:

libhosty/formatter.go

Line 21 in e0bfadd

return fmt.Sprintf("# %-16s\t%s\t#%s", hfl.Address, strings.Join(hfl.Hostnames, " "), hfl.Comment)

Maybe we should get something like:

	return fmt.Sprintf("# %-16s %s #%s", hfl.Address, strings.Join(hfl.Hostnames, " "), hfl.Comment)

That will keep the 16chars for address and uses a space to separate IP-Hostnames-Comment parts