update zcash commit - need solution size getter

sebastianst · sebastianst · commit 2ce641a8b037 · 2017-01-16T13:21:19.000+01:00
diff --git a/zcash b/zcash
@@ -1 +1 @@
-Subproject commit 251876f4ba17c67cd566a3c21c3c1ea9f549e98e
+Subproject commit c20e6edefd5d3a57daf00340659cc07487629638
