Make graphql_object macro supports deriving object field resolvers#652

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zhenwenc wants to merge 2 commits intographql-rust:masterfrom zhenwenc:derive-object-field-resolvers

+970-165

Commits on May 3, 2020

Specify edition to rustfmt settings (REMOVE LATER, OUT OF SCOPE)
zhenwenc
committed

Commits on May 5, 2020

Make graphql_object support derive resolvers for struct fields (graphql-rust#553 )
zhenwenc
committed