Update clippy

Manishearth · Manishearth · commit 20ea70d3352e · 2019-04-23T13:05:45.000-07:00
diff --git a/src/tools/clippy b/src/tools/clippy
@@ -1 +1 @@
-Subproject commit d420589e1a8208c85368d07c1644c6725367650b
+Subproject commit 9897442f27f15840b459c3e8a480c9082775fbd1
