feat: Support for auto trait
          #278
        
          
      
                
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Tracking issue: rust-lang/rust#13231
Stable rustc is already able to parse those (with the appropriate feature gate).
Closes #267.
Note: this change is taken from my fork tree-sitter-rust-orchard. I thought I would open PRs for easily portable changes like this one, even if there is no prospect of them being merged soon given the current maintenance status of this repository (as a way of making that status clearer). If that is too noisy, let me know and I'll stop.