Add 6dot variant for unicode and iso braille formats
diff --git a/MagickCore/coder.c b/MagickCore/coder.c
index 32a15ff..6ad82a5 100644
--- a/MagickCore/coder.c
+++ b/MagickCore/coder.c
@@ -154,6 +154,7 @@
     { "IPTCTEXT", "META" },
     { "IPTCWTEXT", "META" },
     { "ISOBRL", "BRAILLE" },
+    { "ISOBRL6", "BRAILLE" },
     { "JBG", "JBIG" },
     { "JNG", "PNG" },
     { "JPC", "JP2" },
@@ -238,6 +239,7 @@
     { "TIF", "TIFF" },
     { "TTC", "TTF" },
     { "UBRL", "BRAILLE" },
+    { "UBRL6", "BRAILLE" },
     { "VDA", "TGA" },
     { "VST", "TGA" },
     { "WIZARD", "MAGICK" },