Update clippy

Manishearth · Manishearth · commit 56b269af74f7 · 2019-10-01T17:53:57.000-07:00
diff --git a/src/tools/clippy b/src/tools/clippy
@@ -1 +1 @@
-Subproject commit edd90473ec5ba29b9ae1ee706c982e7046a6e63e
+Subproject commit 648e5b90b49af483d07caa8e413473a4517853d6
