add go version to deploy on heroku

cassiobotaro · cassiobotaro · commit 3cf58c81ec99 · 2021-03-11T23:17:01.000-03:00
diff --git a/go.mod b/go.mod
@@ -8,3 +8,4 @@ require (
 )
 
 // +heroku install ./cmd/...
+// +heroku goVersion go1.16
