Lua filters: preload text module (#4077)

The `text` module is preloaded in lua. The module contains some UTF-8
aware string functions, implemented in Haskell.  The module is loaded on
request only, e.g.:

    text = require 'text'
    function Str (s)
      s.text = text.upper(s.text)
      return s
    end

1 files changed, 1 insertions, 0 deletions

diff --git a/pandoc.cabal b/pandoc.cabal
index 7e0790973..7dfc06ed5 100644
--- a/pandoc.cabal
+++ b/pandoc.cabal
@@ -327,6 +327,7 @@ library
                  scientific >= 0.2 && < 0.4,
                  vector >= 0.10 && < 0.13,
                  hslua >= 0.9 && < 0.10,
+                 hslua-module-text >= 0.1.2 && < 0.2,
                  binary >= 0.5 && < 0.9,
                  SHA >= 1.6 && < 1.7,
                  haddock-library >= 1.1 && < 1.5,