Update submodule version to 3a181009

Point to the new, merged version of the submodule branch
diff --git a/crypto b/crypto
index 2169a5e..3a18100 160000
--- a/crypto
+++ b/crypto
@@ -1 +1 @@
-Subproject commit 2169a5e54ded734f7844af1a16c39b993c2a992c
+Subproject commit 3a1810095826516370b08fd01129d989fa950ecb