0.3.1-beta

The signature for entity mappers has changed.

See https://github.com/landmarkhw/Dapper.GraphQL/blob/master/Dapper.GraphQL.Test/EntityMappers/PersonEntityMapper.cs for an example.

Also, the Execute() method for queries has changed to require the selection set for GraphQL, to facilitate proper object mapping after the query is executed. See https://github.com/landmarkhw/Dapper.GraphQL/blob/master/Dapper.GraphQL.Test/InsertTests.cs#L98 for an example.