go.mod: bump minimum go version to 1.13

joelanford · joelanford · commit e12a8fb5321e · 2019-10-17T00:33:47.000-04:00
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module sigs.k8s.io/controller-runtime
 
-go 1.12
+go 1.13
 
 require (
 	github.com/evanphx/json-patch v4.5.0+incompatible
