Fix errors

doc.go

@@ -23,7 +23,7 @@ Adding a header to each request
 		return r, nil
 	})
 
-# Note that the function is called before the proxy sends the request to the server
+> Note that the function is called before the proxy sends the request to the server
 
 For printing the content type of all incoming responses
 

internal/signer/signer.go

@@ -15,6 +15,7 @@ import (
 	"net"
 	"runtime"
 	"sort"
+	"strings"
 	"time"
 )
 
@@ -25,9 +26,7 @@ func hashSorted(lst []string) []byte {
 	copy(c, lst)
 	sort.Strings(c)
 	h := sha256.New()
-	for _, s := range c {
-		h.Write([]byte(s + ","))
-	}
+	h.Write([]byte(strings.Join(c, ",")))
 	return h.Sum(nil)
 }