allow continuable strings, re: #48

diff --git a/src/prolog/parser b/src/prolog/parser
index 2258588947fc8fe647c466f7e104252c67ae3da4..cd2fdbb463a36a2743042206f56020b5bf0359cf 160000 (submodule)
--- a/src/prolog/parser
+++ b/src/prolog/parser
@@ -1 +1 @@
-Subproject commit 2258588947fc8fe647c466f7e104252c67ae3da4
+Subproject commit cd2fdbb463a36a2743042206f56020b5bf0359cf