Update to the rustfmt in rust 1.27, which is now stable. (#377)

lib/simplejit/src/backend.rs

@@ -3,8 +3,10 @@
 use cretonne_codegen::binemit::{Addend, CodeOffset, NullTrapSink, Reloc, RelocSink};
 use cretonne_codegen::isa::TargetIsa;
 use cretonne_codegen::{self, ir, settings};
-use cretonne_module::{Backend, DataContext, DataDescription, Init, Linkage, ModuleNamespace,
-                      ModuleResult, Writability};
+use cretonne_module::{
+    Backend, DataContext, DataDescription, Init, Linkage, ModuleNamespace, ModuleResult,
+    Writability,
+};
 use cretonne_native;
 use libc;
 use memory::Memory;