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/line_index.rs

@@ -145,7 +145,7 @@ pub fn to_line_col(text: &str, offset: TextUnit) -> LineCol {
 mod test_line_index {
     use super::*;
     use proptest::{prelude::*, proptest};
-    use ra_text_edit::test_utils::{arb_text, arb_offset};
+    use ra_text_edit::test_utils::{arb_offset, arb_text};
 
     #[test]
     fn test_line_index() {