update minimum version

ChrisRackauckas · ChrisRackauckas · commit ea3f1ae97f52 · 2017-07-02T22:34:21.000-07:00
diff --git a/REQUIRE b/REQUIRE
@@ -1,6 +1,6 @@
 julia 0.6.0
 Parameters 0.5.0
-DiffEqBase 1.13.0
+DiffEqBase 1.15.0
 RecursiveArrayTools 0.8.0
 DataStructures 0.4.6
 Juno 0.2.5
