CMake: fix standard

to avoid inclusion order issues between boost & pinocchio after
clang-format

Author: nim65s

CMakeLists.txt

@@ -31,7 +31,7 @@ INCLUDE(cmake/sphinx.cmake)
 # Project definition
 COMPUTE_PROJECT_ARGS(PROJECT_ARGS LANGUAGES CXX)
 PROJECT(${PROJECT_NAME} ${PROJECT_ARGS})
-CHECK_MINIMAL_CXX_STANDARD(11 ENFORCE)
+CHECK_MINIMAL_CXX_STANDARD(14 ENFORCE)
 
 # Project dependencies
 ADD_PROJECT_DEPENDENCY(dynamic-graph REQUIRED)