aerro 0.6.4

Cross-service gRPC error framework for Rust.
Documentation 
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error: missing `code = AlreadyExists` (PascalCase tonic::Code variant name)
 --> tests/ui/fail/missing_code.rs:5:5
  |
5 | /     #[aerro(category = Business)]
6 | |     NoCode,
  | |__________^