Auto merge of #63975 - topecongiro:rustfmt-1.4.6, r=nikomatsakis

Update rustfmt to 1.4.6 This PR updates rustfmt to 1.4.6. [CHANGELOG](https://github.com/rust-lang/rustfmt/blob/v1.4.6/CHANGELOG.md#146-2019-08-28).
rust-lang · Aug 31, 2019 · 2d851b3 · 2d851b3
2 parents fd68d02 + 8e10725
commit 2d851b3
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diff --git a/Cargo.lock b/Cargo.lock
@@ -3579,7 +3579,7 @@ dependencies = [
 
 [[package]]
 name = "rustfmt-nightly"
-version = "1.4.5"
+version = "1.4.6"
 dependencies = [
  "annotate-snippets",
  "atty",

diff --git a/src/tools/rustfmt b/src/tools/rustfmt