[gtksourceview] README: remove version number from readme

[Christian Hergert <chergert src gnome org>]

commit 4b677473c057a73929406b5425b95abc23d30b7a
Author: Christian Hergert <chergert redhat com>
Date:   Fri Feb 14 13:28:47 2020 -0800

    README: remove version number from readme
    
    This is annoying to have to update on every release, and it's really
    not any more valuable than checking tags or meson.build.

 README.md | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/README.md b/README.md
index 1515e87e..0bdef6bd 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,6 @@
 GtkSourceView
 =============
 
-This is version 4.4.0 of GtkSourceView.
-
 GtkSourceView is a GNOME library that extends GtkTextView, the standard GTK+
 widget for multiline text editing. GtkSourceView adds support for syntax
 highlighting, undo/redo, file loading and saving, search and replace, a