Add newline support in nolyrics environments

patacrep/songs/chordpro/data/latex/content_verse

@@ -3,6 +3,8 @@
 \musicnote{\nolyrics
   (* for line in content.lines *)
     (( render(line) ))
+    (*- if not loop.last *)\newline(* endif *)
+
   (* endfor *)
 }
 \end{verse*}

test/test_chordpro/nolyrics.tex

@@ -21,7 +21,7 @@
 
 \begin{verse*}
 \musicnote{\nolyrics
-    \[A] \[B]
+    \[A] \[B]\newline
     \[C]
 }
 \end{verse*}