using int instead of string

main.go

@@ -116,10 +116,10 @@ func main() {
 			Name:  "env-file",
 			Usage: "source env file",
 		},
-		cli.StringFlag{
+		cli.IntFlag{
 			Name:  "max-concurrency",
 			Usage: "customize number concurrent files to process",
-			Value: "100",
+			Value: 100,
 			EnvVar: "PLUGIN_MAX_CONCURRENCY",
 
 		},
@@ -152,7 +152,7 @@ func run(c *cli.Context) error {
 		Redirects:              c.Generic("redirects").(*MapFlag).Get(),
 		CloudFrontDistribution: c.String("cloudfront-distribution"),
 		DryRun:                 c.Bool("dry-run"),
-		MaxConcurrency:         c.String("max-concurrency"),
+		MaxConcurrency:         c.Int("max-concurrency"),
 	}
 
 	return plugin.Exec()

plugin.go

@@ -6,7 +6,6 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
-	"strconv"
 )
 
 type Plugin struct {
@@ -29,7 +28,7 @@ type Plugin struct {
 	PathStyle              bool
 	client                 AWS
 	jobs                   []job
-	MaxConcurrency         string
+	MaxConcurrency         int
 }
 
 type job struct {
@@ -156,13 +155,7 @@ func (p *Plugin) createInvalidateJob() {
 
 func (p *Plugin) runJobs() {
 	client := p.client
-	maxConcurrency, err := strconv.Atoi(p.MaxConcurrency)
-	if err != nil {
-		fmt.Printf("ERROR: invalid input for max-concurrency")
-		os.Exit(1)
-	}
-
-	jobChan := make(chan struct{}, maxConcurrency)
+	jobChan := make(chan struct{}, p.MaxConcurrency)
 	results := make(chan *result, len(p.jobs))
 	var invalidateJob *job