Build project as c++17

Build project as c++17.

Change-Id: I2e1c6c756d4f304a287061f2dd75020ccde12432
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3940f27..723b300 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 2.8.10 FATAL_ERROR)
 project(buttons CXX)
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_INSTALL_RPATH ${CMAKE_INSTALL_RPATH} ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR})