message: rm support for cmake < 3.1.0 as min cmake required is 3.10.0
diff: set(MY_CXX_WARNING_FLAGS " -Wall -pedantic -W")
  -if("${CMAKE_VERSION}" VERSION_GREATER 3.1.0)
  set(CMAKE_CXX_STANDARD 11)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  -else()
  - set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
  - set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -std=c++11")
  - set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -std=c++11")
  - set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -std=c++11")
  - set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -std=c++11")
  -endif()
  include_directories(
  ${HDLCONVERTOR_SOURCE_DIR}/src
  