[gspell] readme: add section About versions

[Sébastien Wilmet <swilmet src gnome org>]

commit 8ea101e8985b75e07b79412a55abe78f2846cba1
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Nov 20 14:54:53 2015 +0100

    readme: add section About versions

 README |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index af9057f..a8cf404 100644
--- a/README
+++ b/README
@@ -27,6 +27,14 @@ database before filing a new bug:
     https://bugzilla.gnome.org/page.cgi?id=browse.html&product=gspell
 
 
+About versions
+--------------
+
+gspell follows the GNOME release schedule.
+
+gspell 0.1.x should be installed alongside GNOME 3.18.
+
+
 WARNING - API (un)stability
 ---------------------------