update the rustfmt submodule

Jorge Aparicio · Jorge Aparicio · commit ca931c443cf3 · 2017-03-30T00:00:03.000Z
diff --git a/rustfmt b/rustfmt
@@ -1 +1 @@
-Subproject commit 3d2e52a21465a0bf3c839a7b92a0a4cfa25e2166
+Subproject commit 603f26d8f18890a438c4febda3d16d51579a8036
