refactor: explicitly check for primitive

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/repl/lib/commands/keybindings.js

@@ -24,7 +24,7 @@
 
 var format = require( '@stdlib/string/format' );
 var contains = require( '@stdlib/assert/contains' );
-var isString = require( '@stdlib/assert/is-string' );
+var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
 var ACTIONS = require( './../actions.js' );