[gtkmm/gtkmm-3-24: 1/2] Document Gtk::CSsProviderError as @newin{3, 16}

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 5a00f60d6a2cd9feba66ed83968bda5b8d831b21
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Wed Aug 29 14:04:48 2018 +0200

    Document Gtk::CSsProviderError as @newin{3,16}

 gtk/src/cssprovider.hg | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/src/cssprovider.hg b/gtk/src/cssprovider.hg
index b7c692ce..dc314dd5 100644
--- a/gtk/src/cssprovider.hg
+++ b/gtk/src/cssprovider.hg
@@ -27,6 +27,8 @@ _PINCLUDE(glibmm/private/object_p.h)
 namespace Gtk
 {
 /** Exception class for Gtk::CssProvider errors.
+ *
+ * @newin{3,16}
  */
 _WRAP_GERROR(CssProviderError, GtkCssProviderError, GTK_CSS_PROVIDER_ERROR)