[vala/staging] docs: Bump glib requirement in README.md

[Rico Tzschichholz <ricotz src gnome org>]

commit a67b8ecb4c691c4beda2b873e187071b9c15afa4
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Mar 27 09:53:23 2019 +0100

    docs: Bump glib requirement in README.md

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 498840a55..ce3b27d2c 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@ Install the following packages:
 
  * a C compiler, e.g. GCC
  * a C library, e.g. glibc
- * glib (>= 2.40)
+ * glib (>= 2.48)
  * flex
  * bison
  * Graphviz (libgvc) (>= 2.16) to build valadoc