upgrade: go version

54m · 54m · commit 7e803e82b877 · 2021-09-02T21:24:29.000+09:00
diff --git a/go.mod b/go.mod
@@ -1,6 +1,6 @@
 module github.com/gcp-kit/stalog
 
-go 1.12
+go 1.13
 
 require (
 	github.com/go-chi/chi v4.0.3+incompatible
