message: Link additional packages in Travis script
  I see that indirect dependencies of the top level script are getting
  installed in a non-linked way, so explicitly link them to ensure we
  don't have multiple copies floating around.
diff: @@ -10,4 +10,4 @@ before_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-utils && npm install)
  - - npm link && npm link packages/graphql-language-service-interface && npm link packages/graphql-language-service-server && npm link packages/graphql-language-service-utils
  + - npm link && npm link packages/graphql-language-service-types && npm link packages/graphql-language-service-config && npm link packages/graphql-language-service-parser && npm link packages/graphql-language-service-interface && npm link packages/graphql-language-service-server && npm link packages/graphql-language-service-utils
  