Last changes after review of go-start heroku

Procfile

+web: bin/assignment1

go.mod

+module git.gvk.idi.ntnu.no/johannta/assignment1
+
+go 1.13

main_test.go

 package main
 
-func main() {
-	$END$
+/*func TestMain(t *testing.T) {
+	want := "Hello, world."
+	if got := Hello(); got != want {
+		t.Errorf("Hello() = %q, want %q", got, want)
+	}
 }
+*/