use a better naming for the variable

Signed-off-by: Ryan Leung <rleungx@gmail.com>

cmd/gosec/main.go

@@ -247,17 +247,17 @@ func saveReport(filename, format string, rootPaths []string, reportInfo *gosec.R
 	return nil
 }
 
-func convertToScore(severity string) (gosec.Score, error) {
-	severity = strings.ToLower(severity)
-	switch severity {
+func convertToScore(value string) (gosec.Score, error) {
+	value = strings.ToLower(value)
+	switch value {
 	case "low":
 		return gosec.Low, nil
 	case "medium":
 		return gosec.Medium, nil
 	case "high":
 		return gosec.High, nil
 	default:
-		return gosec.Low, fmt.Errorf("provided severity '%s' not valid. Valid options: low, medium, high", severity)
+		return gosec.Low, fmt.Errorf("provided value '%s' not valid. Valid options: low, medium, high", value)
 	}
 }