message: add g++9 and g++10 to gitlab CI
diff: @@ -17,6 +17,20 @@ build_linux:gcc5:
  - g++ --version
  - make -j
  +build_linux:gcc10:
  + image: "ubuntu:groovy"
  + stage: build
  + script:
  + - g++ --version
  + - make -j
  +
  +build_linux:gcc9:
  + image: "ubuntu:focal"
  + stage: build
  + script:
  + - g++ --version
  + - make -j
  +
  build_linux:gcc7:
  image: "ubuntu:bionic"
  stage: build
  