message: travis: drop gcc 7 & move to xcode 11.3
diff: @@ -45,19 +45,6 @@ script:
  matrix:
  include:
  - - env: CMAKE_CXX_COMPILER=g++ CMAKE_BUILD_TYPE=Debug
  - os: linux
  - dist: bionic
  - addons: &gcc7
  - apt:
  - packages:
  - - *default_packages
  -
  - - env: CMAKE_CXX_COMPILER=g++ CMAKE_BUILD_TYPE=Release
  - os: linux
  - dist: bionic
  - addons: *gcc7
  -
  - env: CMAKE_CXX_COMPILER=g++-8 CMAKE_BUILD_TYPE=Debug
  os: linux
  dist: bionic
  @@ -120,7 +107,7 @@ matrix:
  - env: CMAKE_BUILD_TYPE=Debug CMAKE_CXX_FLAGS=-fsanitize=address,undefined
  os: osx
  - osx_image: xcode11
  + osx_image: xcode11.3
  addons: &mac
  homebrew:
  packages:
  @@ -131,5 +118,5 @@ matrix:
  - env: CMAKE_BUILD_TYPE=Release
  os: osx
  - osx_image: xcode11
  + osx_image: xcode11.3
  addons: *mac
  