Default to the C++14 standard

This fixes build against contemporary GTest which requires C++14 or later.

Author: arrowd

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.6)
 
 project(linuxdeploy-desktopfile CXX)
 
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${PROJECT_SOURCE_DIR}/cmake/Modules/")