Don't use features anymore, since it is stable

fitzgen · fitzgen · commit d48e8103e410 · 2018-10-29T11:29:43.000+01:00
diff --git a/crate/src/lib.rs b/crate/src/lib.rs
@@ -1,5 +1,3 @@
-#![feature(use_extern_macros)]
-
 #[macro_use]
 extern crate cfg_if;
 
