Updates shyaml: 70d793a fix: UTF-8 values would end in tracebacks (fixes #51)

diff --git a/shyaml b/shyaml
index 8dcf9bb39f995564271600a4dae1fc114077c2e0..70d793ae0d2bf84e5d4d0944d0801af1714830a2 160000 (submodule)
--- a/shyaml
+++ b/shyaml
@@ -1 +1 @@
-Subproject commit 8dcf9bb39f995564271600a4dae1fc114077c2e0
+Subproject commit 70d793ae0d2bf84e5d4d0944d0801af1714830a2