Update rls to beta (1.21) branch

Nick Cameron · Nick Cameron · commit 73fee0d46728 · 2017-08-31T12:48:36.000+12:00
diff --git a/src/Cargo.lock b/src/Cargo.lock
diff --git a/src/Cargo.toml b/src/Cargo.toml
@@ -55,6 +55,3 @@ debug-assertions = false
 [profile.test]
 debug = false
 debug-assertions = false
-
-[replace]
-"https://github.com/rust-lang/cargo#0.22.0" = { path = "tools/cargo" }
diff --git a/src/tools/rls b/src/tools/rls
@@ -1 +1 @@
-Subproject commit 25ffb3a3d7809b4fa112f3e04e926eb539dd5e90
+Subproject commit 86ff0b1413ef45aa05ccca968242ac1f09c12817
