Fixing some of requested changes for pull request

benchmark.js

@@ -21,4 +21,28 @@ suite('chalk', () => {
 	bench('nested styles', () => {
 		chalk.red('the fox jumps', chalk.underline.bgBlue('over the lazy dog') + '!');
 	});
+
+	const wrappedChalk = new chalk.constructor({
+		wrapper: {
+			before: '@',
+			after: '#'
+		}
+	});
+
+	bench('wrapped single style', () => {
+		wrappedChalk.red('the fox jumps');
+	});
+
+	bench('wrapped several styles', () => {
+		wrappedChalk.blue.bgRed.bold('the fox jumps over the lazy dog');
+	});
+
+	const cachedWrapper = wrappedChalk.blue.bgRed.bold;
+	bench('cached wrapped styles', () => {
+		cachedWrapper('the fox jumps over the lazy dog');
+	});
+
+	bench('nested wrapped styles', () => {
+		wrappedChalk.red('the fox jumps', wrappedChalk.underline.bgBlue('over the lazy dog') + '!');
+	});
 });