fix(build): license is a multi field

Author: hmenke

build.lua

@@ -63,7 +63,7 @@ uploadconfig = {
   ctanPath = "/graphics/pgf/base",
   description = [[<p>PGF is a macro package for creating graphics. It is platform- and format-independent and works together with the most important TeX backend drivers, including pdfTeX and dvips. It comes with a user-friendly syntax layer called TikZ.<br></p><p>Its usage is similar to <a data-cke-saved-href="/pkg/pstricks-base" href="/pkg/pstricks-base">pstricks</a> and the standard picture environment. PGF works with plain (pdf-)TeX, (pdf-)LaTeX, and ConTeXt. Unlike <a data-cke-saved-href="/pkg/pstricks-base" href="/pkg/pstricks-base">pstricks</a>, it can produce either PostScript or PDF output.<br></p>]],
   email = "pgf-tikz@tug.org",
-  license = "fdl;gpl2;lppl1.3c",
+  license = { "fdl", "gpl2", "lppl1.3c" },
   note_file = "CTAN_NOTES.md",
   pkg = "pgf",
   repository = "https://github.com/pgf-tikz/pgf",