[gnote/meson] Use C++14

[Aurimas Černius <aurimasc src gnome org>]

commit 46a8c93183ff558b45037f19564684cea552c635
Author: Aurimas Černius <aurisc4 gmail com>
Date:   Mon Apr 5 21:26:17 2021 +0300

    Use C++14

 meson.build | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 0d9d3651..0a701e3c 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,8 @@
-project('gnote', 'cpp', version: '41.alpha', meson_version: '>=0.50.0')
+project('gnote', 'cpp',
+  version: '41.alpha',
+  meson_version: '>=0.50.0',
+  default_options: 'cpp_std=c++14',
+)
 
 gnome = import('gnome')
 i18n = import('i18n')