Update rustfmt

Author: nrc

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "rls"
-version = "0.131.6"
+version = "1.31.6"
 edition = "2018"
 authors = ["Nick Cameron <[email protected]>", "The RLS developers"]
 description = "Rust Language Server - provides information about Rust programs to IDEs and other tools"
@@ -32,7 +32,7 @@ rls-rustc = "0.5.0"
 rls-span = { version = "0.4", features = ["serialize-serde"] }
 rls-vfs = "0.7"
 rustc_tools_util = { git = "https://github.com/rust-lang-nursery/rust-clippy", rev = "f5d868c9edfc6c2a9310d564a2f738bec67dfd6b" }
-rustfmt-nightly = "0.99.9"
+rustfmt-nightly = "1.0.0"
 rustc-serialize = "0.3"
 serde = "1.0"
 serde_json = "1.0"