Upgrade to C++20

Change-Id: I6bc6716316d464bd1150b0e4b8706d50739c5900
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
diff --git a/meson.build b/meson.build
index ec2e102..8779483 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@
     'cpp',
     default_options: [
         'warning_level=3',
-        'cpp_std=c++17'
+        'cpp_std=c++20'
     ],
     license: 'Apache-2.0',
     version: '0.1',