feat: add indexOf to namespace

Author: kgryte

lib/node_modules/@stdlib/array/base/lib/index.js

@@ -567,6 +567,15 @@ setReadOnly( ns, 'getter', require( '@stdlib/array/base/getter' ) );
 */
 setReadOnly( ns, 'incrspace', require( '@stdlib/array/base/incrspace' ) );
 
+/**
+* @name indexOf
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/array/base/index-of}
+*/
+setReadOnly( ns, 'indexOf', require( '@stdlib/array/base/index-of' ) );
+
 /**
 * @name last
 * @memberof ns