message: Add a link to scalar types
  I didn't know what these are. This may help people in the future. It's a small add that doesn't affect the meaning at all, but may help adoption.
diff: # @okgrow/graphql-scalars
  -A library of custom GraphQL scalar types for creating precise type-safe GraphQL schemas.
  +A library of custom GraphQL [scalar types](http://graphql.org/learn/schema/#scalar-types) for creating precise type-safe GraphQL schemas.
  ## Installation
  