Update rustfmt

SimonSapin · Xanewok · commit 2c2a6acd99de · 2018-12-10T08:59:10.000+01:00
Pick up rust-lang/rustfmt#3236
diff --git a/src/tools/rustfmt b/src/tools/rustfmt
@@ -1 +1 @@
-Subproject commit 43206f41625b8ad670d65bcad37686b40a1c7c48
+Subproject commit 8222381d8f47f2a40dfbb11c5b28bddbd2f62f97
