Fix failed check output

Author: lann

README.md

@@ -8,14 +8,15 @@ Token expiration: NONE
 Rate limit usage: 6 / 5000 (~0%)
 OAuth scopes: gist, read:org, repo, workflow
 
-$ TOKEN="<some expiring token>" github-token-monitor --token-env-vars TOKEN
-Checking "TOKEN"...
+$ OLD_TOKEN="<some expiring token>" github-token-monitor --token-env-vars OLD_TOKEN
+Checking "OLD_TOKEN"...
 Token user login: your-github-username
 Token expiration: 2025-07-09 21:27:10 +0000 UTC (9.1 days)
 WARNING: Expiring soon!
 Rate limit usage: 9 / 5000 (~0%)
 OAuth scopes: read:packages
 
+Error: checks failed for token(s): OLD_TOKEN
 exit status 1
 ```
 

main.go

@@ -36,12 +36,9 @@ var flags struct {
 
 func main() {
 	err := run()
-	if _, isFailedChecks := err.(failedChecksError); isFailedChecks {
-		os.Exit(1)
-	}
 	if err != nil {
 		fmt.Printf("Error: %v\n", err)
-		os.Exit(2)
+		os.Exit(1)
 	}
 }