Remove maintainers from .app.src file

src/epgsql.app.src

@@ -8,7 +8,6 @@
                   ssl]},
   {env, []},
   {included_applications, []},
-  {maintainers, ["David N. Welton"]},
   {licenses, ["BSD"]},
   {links, [{"Github", "https://github.com/epgsql/epgsql"}]}
 ]}.