fix parsing of machine files on windows

Author: ezekg

machine_file.go

@@ -107,8 +107,9 @@ func (lic *MachineFile) certificate() (*certificate, error) {
 	payload := lic.Certificate
 
 	// Remove header and footer
-	payload = strings.TrimPrefix(payload, "-----BEGIN MACHINE FILE-----\n")
-	payload = strings.TrimSuffix(payload, "-----END MACHINE FILE-----\n")
+	payload = strings.TrimPrefix(payload, "-----BEGIN MACHINE FILE-----")
+	payload = strings.TrimSuffix(payload, "-----END MACHINE FILE-----")
+	payload = strings.TrimSpace(payload)
 
 	// Decode
 	dec, err := base64.StdEncoding.DecodeString(payload)