message: Use subshells in Travis config
  This should avoid build failures like this one:
diff: @@ -4,10 +4,10 @@ node_js: stable
  before_install:
  - npm config set spin false --global
  - - cd packages/graphql-language-service-types && npm install
  - - cd packages/graphql-language-service-config && npm link ../graphql-language-service-types && npm install
  - - cd packages/graphql-language-service-parser && npm link ../graphql-language-service-types && npm install
  - - cd packages/graphql-language-service-utils && npm link ../graphql-language-service-types && npm install
  - - cd packages/graphql-language-service-interface && npm link ../graphql-language-service-types && npm link ../graphql-language-service-config && npm link ../graphql-language-service-parser && npm link ../graphql-language-service-utils && npm install
  - - cd packages/graphql-language-service-server && npm link ../graphql-language-service-types && npm link ../graphql-language-service-config && npm link ../graphql-language-service-interface && npm link ../graphql-language-service-interface && npm install
  + - (cd packages/graphql-language-service-types && npm install)
  + - (cd packages/graphql-language-service-config && npm link ../graphql-language-service-types && npm install)
  + - (cd packages/graphql-language-service-parser && npm link ../graphql-language-service-types && npm install)
  + - (cd packages/graphql-language-service-utils && npm link ../graphql-language-service-types && npm install)
  + - (cd packages/graphql-language-service-interface && npm link ../graphql-language-service-types && npm link ../graphql-language-service-config && npm link ../graphql-language-service-parser && npm link ../graphql-language-service-utils && npm install)
  + - (cd packages/graphql-language-service-server && npm link ../graphql-language-service-types && npm link ../graphql-language-service-config && npm link ../graphql-language-service-interface && npm link ../graphql-language-service-interface && npm install)
  - npm link && npm link packages/graphql-language-service-interface && npm link ../graphql-language-service-server && npm link ../graphql-language-service-utils
  