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/folding_ranges.rs

@@ -1,9 +1,10 @@
 use rustc_hash::FxHashSet;
 
 use ra_syntax::{
-    SourceFile, SyntaxNode, TextRange, Direction, SyntaxElement,
-    SyntaxKind::{self, *},
     ast::{self, AstNode, AstToken, VisibilityOwner},
+    Direction, SourceFile, SyntaxElement,
+    SyntaxKind::{self, *},
+    SyntaxNode, TextRange,
 };
 
 #[derive(Debug, PartialEq, Eq)]