bench(stats/base/ndarray/smskrange): use string format utility

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Author: ankitsyadav

lib/node_modules/@stdlib/stats/base/ndarray/smskrange/benchmark/benchmark.js

@@ -26,6 +26,7 @@ var bernoulli = require( '@stdlib/random/array/bernoulli' );
 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
 var pow = require( '@stdlib/math/base/special/pow' );
 var ndarray = require( '@stdlib/ndarray/base/ctor' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var smskrange = require( './../lib' );
 
@@ -111,7 +112,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':len='+len, f );
+		bench( format( '%s:len=%d', pkg, len ), f );
 	}
 }