[devhelp] Update README

[Sébastien Wilmet <swilmet src gnome org>]

commit e4457cd2be340310bf62790ca7e6650089615f2f
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sat Apr 15 17:17:30 2017 +0200

    Update README

 README |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/README b/README
index 01b86d9..1ae1cee 100644
--- a/README
+++ b/README
@@ -1,11 +1,15 @@
 Devhelp information
 ===================
 
+The Devhelp web page:
+
+  https://wiki.gnome.org/Apps/Devhelp
+
 The following packages are required to compile Devhelp:
 
-glib 2.38 (or greater)
-gtk+ 3.19.3 (or greater)
-webkit2gtk-4.0 2.6 (or greater)
+glib >= 2.38
+gtk+ >= 3.20
+webkit2gtk-4.0 >= 2.6
 
 Devhelp's primary goal is to be an API documentation browser for
 GNOME. When you build (or install) a GNOME library, it will build an
@@ -20,7 +24,7 @@ for those index files and display the books they represent.
 Devhelp uses the "XDG Base Directory Specification" to find
 documentation. You can read more about that specification here:
 
-  http://standards.freedesktop.org/basedir-spec/latest/
+  https://specifications.freedesktop.org/basedir-spec/latest/
 
 The list of locations searched for devhelp books is: