Update example to implement private render method

Author: kgryte

lib/node_modules/@stdlib/plot/sparklines/unicode/base/README.md

@@ -156,7 +156,7 @@ var str = sparkline.toString();
 
 ## Examples
 
-<!-- eslint-disable no-restricted-syntax -->
+<!-- eslint-disable no-restricted-syntax, no-underscore-dangle -->
 
 <!-- eslint no-undef: "error" -->
 
@@ -179,7 +179,7 @@ function Chart( opts ) {
 inherit( Chart, Sparkline );
 
 // Implement a custom render method:
-Chart.prototype.render = function render() {
+Chart.prototype._render = function render() {
     var str;
     var i;
 

lib/node_modules/@stdlib/plot/sparklines/unicode/base/examples/index.js

@@ -16,7 +16,7 @@
 * limitations under the License.
 */
 
-/* eslint-disable no-restricted-syntax */
+/* eslint-disable no-restricted-syntax, no-underscore-dangle */
 
 'use strict';
 
@@ -38,7 +38,7 @@ function Chart( opts ) {
 inherit( Chart, Sparkline );
 
 // Implement a custom render method:
-Chart.prototype.render = function render() {
+Chart.prototype._render = function render() {
 	var str;
 	var i;