[libgxps] doc: Add Since: tag to GXPS_VERSION_STRING api docs

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 2908149917e3133bbfc873246ab71f3676b73045
Author: Carlos Garcia Campos <carlosgc gnome org>
Date:   Sat Feb 4 12:43:20 2012 +0100

    doc: Add Since: tag to GXPS_VERSION_STRING api docs

 libgxps/gxps-version.h.in |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/libgxps/gxps-version.h.in b/libgxps/gxps-version.h.in
index 0a20d54..6bd54cd 100644
--- a/libgxps/gxps-version.h.in
+++ b/libgxps/gxps-version.h.in
@@ -61,6 +61,8 @@
  * GXPS_VERSION_STRING:
  *
  * The version number of the GXPS library as a string
+ *
+ * Since: 0.2.1
  */
 #define GXPS_VERSION_STRING "@PACKAGE_VERSION@"