Adding a upgrading SQL script file from 0.5.0 to 0.6.0 (#190)

age--0.5.0--0.6.0.sql

@@ -0,0 +1,12 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "ALTER EXTENSION age UPDATE TO '0.6.0'" to load this file. \quit
+
+CREATE OR REPLACE FUNCTION ag_catalog.age_vle(
+    IN agtype, IN agtype, IN agtype, IN agtype,
+    IN agtype, IN agtype, IN agtype,
+    OUT edges agtype)
+RETURNS SETOF agtype
+LANGUAGE C
+IMMUTABLE
+STRICT
+AS 'MODULE_PATHNAME';