message: Make submodules shallow
diff: [submodule "ecmascript/test262-parser-tests"]
  path = ecmascript/parser/tests/test262-parser
  url = https://github.com/tc39/test262-parser-tests.git
  + shallow = true
  [submodule "tests/projects/rxjs"]
  path = tests/projects/rxjs/repo
  url = https://github.com/ReactiveX/rxjs.git
  + shallow = true
  [submodule "tests/projects/webpack"]
  path = tests/projects/webpack/repo
  url = https://github.com/webpack/webpack.git
  + shallow = true
  [submodule "tests/projects/angular/repo"]
  path = tests/projects/angular/repo
  url = https://github.com/angular/angular.git
  + shallow = true
  