allow rustfmt to reorder imports

This wasn't a right decision in the first place, the feature flag was
broken in the last rustfmt release, and syntax highlighting of imports
is more important anyway

crates/ra_ide_api/src/display/structure.rs

@@ -2,7 +2,7 @@ use crate::TextRange;
 
 use ra_syntax::{
     algo::visit::{visitor, Visitor},
-    ast::{self, AttrsOwner, NameOwner, TypeParamsOwner, TypeAscriptionOwner},
+    ast::{self, AttrsOwner, NameOwner, TypeAscriptionOwner, TypeParamsOwner},
     AstNode, SourceFile, SyntaxKind, SyntaxNode, WalkEvent,
 };