Update libuv: v1.17.0 -> v1.20.3

1st1 · 1st1 · commit 572524a6144c · 2018-05-23T15:53:25.000-04:00
diff --git a/vendor/libuv b/vendor/libuv
@@ -1 +1 @@
-Subproject commit 1344d2bb82e195d0eafc0b40ba103f18dfd04cc5
+Subproject commit 8cfd67e59195251dff793ee47c185c9d6a8f3818
