Add missing spaces

Author: kgryte

lib/node_modules/@stdlib/stats/incr/mstdev/test/test.js

@@ -210,7 +210,7 @@ tape( 'if not provided an input value, the accumulator function returns the curr
 	}
 	t.equal( acc(), sqrt( 0.5 ), 'returns current corrected sample standard deviation' );
 
-	acc( data[ data.length-1] );
+	acc( data[ data.length-1 ] );
 
 	expected = sqrt( 19.0 );
 	actual = acc();
@@ -237,7 +237,7 @@ tape( 'if not provided an input value, the accumulator function returns the curr
 	}
 	t.equal( acc(), sqrt( 6.5 ), 'returns current unbiased sample variance' );
 
-	acc( data[ data.length-1] );
+	acc( data[ data.length-1 ] );
 
 	expected = sqrt( 12.666666666666666 );
 	actual = acc();