[gnome-latex] Update vala required version

[Sébastien Wilmet <swilmet src gnome org>]

commit 423c7e44306556c006cbd72feee248693c07e42f
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Fri Dec 6 15:06:05 2019 +0100

    Update vala required version
    
    Tested with Vala 0.46.5.

 README       | 2 +-
 configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README b/README
index 97e305e..bd8ab7e 100644
--- a/README
+++ b/README
@@ -30,7 +30,7 @@ Dependencies
 * Latexmk >= 4.31 (optional, but strongly recommended)
 
 And for building the sources:
-* Vala = 0.40 (may be optional), attention GNOME LaTeX cannot be built with Vala >= 0.42.
+* Vala >= 0.46 (may be optional)
 * yelp-tools
 
 If you are installing GNOME LaTeX from a tarball, you don't have to install
diff --git a/configure.ac b/configure.ac
index fc77e52..3f4abbf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,7 +33,7 @@ GTK_REQUIRED_VERSION="3.22"
 GTKSOURCEVIEW_REQUIRED_VERSION="4.0"
 TEPL_REQUIRED_VERSION="4.3"
 GSPELL_REQUIRED_VERSION="1.8"
-VALA_REQUIRED_VERSION="0.34"
+VALA_REQUIRED_VERSION="0.46"
 GEE_REQUIRED_VERSION="0.10"
 
 AC_SUBST([GLIB_REQUIRED_VERSION])