cmake: update to C++20

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Id042565981ccbc3d4eb18850562c3f3a70aee67a
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ee58258..6412635 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 
 option (YOCTO "Use YOCTO depedencies system" OFF)
 include (ExternalProject)
-set (CMAKE_CXX_STANDARD 17)
+set (CMAKE_CXX_STANDARD 20)
 set (CMAKE_CXX_STANDARD_REQUIRED ON)
 set (CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})