bench: refactor to use string interpolation in math/base/special/beta

Author: parthodas23

lib/node_modules/@stdlib/math/base/special/beta/benchmark/benchmark.native.js

@@ -25,6 +25,7 @@ var bench = require( '@stdlib/bench' );
 var uniform = require( '@stdlib/random/array/uniform' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
 var tryRequire = require( '@stdlib/utils/try-require' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 
 
@@ -38,7 +39,7 @@ var opts = {
 
 // MAIN //
 
-bench( pkg+'::native', opts, function benchmark( b ) {
+bench( format( '%s::native', pkg ), opts, function benchmark( b ) {
 	var x;
 	var y;
 	var z;