Add integrity hashes to yarn.lock (#1538)
Add integrity hashes to yarn.lock (#1538)

The field was added in yarn@1.1.0.
See yarnpkg/yarn#5042 for more information.
It fully compatible with previous versions of Yarn
enaqx/graphql-js,graphql/graphql-js,enaqx/graphql-js,enaqx/graphql-js,graphql/graphql-js,graphql/graphql-js