I'm preparing a colophon for a book I'm writing in memoir class. The code is as follows:
\documentclass{memoir}
\usepackage{lipsum}
\usepackage{nth}
\usepackage{textcomp}
\usepackage{multicol}
\setlength\parindent{0pt}
\setlength\parskip{5pt}
\begin{document}
\thispagestyle{empty}
~\vfill
\textbf{My Awesome Book}, \textsc{\nth{3} Edition} \\
Copyright \textcopyright{} \the\year{} John Doe.\\
Some Rights Reserved.\\
Last edited: \today.\\
\begin{multicols}{2}
Some Text\\
More Text\\
\footnotesize
\lipsum[1-4]
\end{multicols}
\clearpage
\end{document}
Which produces the following output (excerpted):
Everything looks as it should. There's just one problem: compiling this code (with lualatex, incidentally), gives the following warnings:
Underfull \hbox (badness 10000) in paragraph at lines 16--20
Underfull \hbox (badness 10000) in paragraph at lines 22--24
These warnings disappear when the line breaks \\ are removed. Is there anyway to accomplish what I'm trying to do without producing these warnings? Furthermore, is there a more "correct" way to have lines of text which aren't organized into paragraphs?

\\it will always give an infinite(10000) bad line (the\\that are being used for line breaks are fine and do not give any warning) just the ones after\today.and afterMore Text– David Carlisle Apr 04 '17 at 18:05\\and allow\parskipto add space or if you need extra space add a blank line then\bigskipor\vspace{3.898cm}or whatever you need – David Carlisle Apr 04 '17 at 18:09