[gnome-raw-thumbnailer] make it obvious that -h will show help

[Hubert Figuière <hub src gnome org>]

commit d4d72a961432540f64bf4c836d45fa58f6e0ffb9
Author: Anton Keks <anton codeborne com>
Date:   Thu Jan 2 23:07:30 2014 +0200

    make it obvious that -h will show help

 src/raw-thumbnailer.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/raw-thumbnailer.c b/src/raw-thumbnailer.c
index c39db5b..d638102 100644
--- a/src/raw-thumbnailer.c
+++ b/src/raw-thumbnailer.c
@@ -136,7 +136,7 @@ int main (int argc, char ** argv)
     g_log_set_always_fatal (fatal_mask);
   }
   if (filenames == NULL || g_strv_length (filenames) != 2) {
-    g_print ("Expects an input and an output file\n");
+    g_print ("Input and output files are expected. Use -h for help.\n");
     return 1;
   }