Bump to cecil/master/b77420ae (#146)

jonpryor · web-flow · commit 8e0a76634ec2 · 2017-05-26T08:52:25.000-04:00
Prep for release.
diff --git a/external/cecil b/external/cecil
@@ -1 +1 @@
-Subproject commit 5f93431f2d699e9b090a5a14db5941a18b1e171b
+Subproject commit b77420aee444dab2adfb2f7efa4a9a865a4aa9b4
