Remove useless feature attribute

`iter_arith` has been stabilized in rustc 1.11.0.

diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 5ba52374135ef79b35ae2afdb5d525172acda9b8..4238ab6f122226e839f547af3751fea86fb8895f 100644 (file)
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -3,7 +3,6 @@
 #![feature(box_syntax)]
 #![feature(collections)]
 #![feature(custom_attribute)]
-#![feature(iter_arith)]
 #![feature(question_mark)]
 #![feature(rustc_private)]
 #![feature(slice_patterns)]