Make the example runnable and fix go generate syntax

Makefile

@@ -1,6 +1,8 @@
 all:
-	@go generate && go build
+	@go generate && go build . && ./go-event-sourcing-sample
 
 clean:
-	@rm -f goes
-	@rm -f *_string.go
+	@rm -f go-event-sourcing-sample
+
+install-stringer:
+	@go install golang.org/x/tools/cmd/stringer

README.md

@@ -1,12 +1,11 @@
-###Event Sourcing in Go
+### Event Sourcing in Go
 
-This is the repository for the code which accompanies my post on Event Sourcing in Go. The original post is [here](http://jen20.com/2015/02/08/event-sourcing-in-go.html).
+This is the repository for the code which accompanies my post on Event Sourcing in Go. The original post is [here](https://jen20.dev/post/event-sourcing-in-go/).
 
 To build and run:
 
 - `make`
-- `./goes`
 
-To clean generated code and the binary:
+To clean the binary:
 
 - `make clean`

frequent_flier_events.go

@@ -4,12 +4,12 @@ package main
 type Status int
 
 const (
-	StatusRed    Status = iota
-	StatusSilver Status = iota
-	StatusGold   Status = iota
+	StatusRed Status = iota
+	StatusSilver
+	StatusGold
 )
 
-// go:generate stringer -type=Status
+//go:generate stringer -type=Status
 
 type FrequentFlierAccountCreated struct {
 	AccountId         string

go.mod

@@ -0,0 +1,3 @@
+module github.com/jen20/go-event-sourcing-sample
+
+go 1.23.1