message: appveyor: clone with submodules v2
diff: image: Visual Studio 2017
  -git:
  - depth: 1
  - submodules: true
  -
  environment:
  matrix:
  @@ -18,6 +14,7 @@ environment:
  # CYGWIN: "c:\\cygwin64"
  install:
  + - 'git submodule update --init --recursive'
  - "curl -fsS -o antlr4-complete.jar https://www.antlr.org/download/antlr-4.7.2-complete.jar"
  - "git clone https://github.com/antlr/antlr4"
  - "cd antlr4/runtime/Cpp"
  