fix: add missing property to rule meta

Author: headlessNode

lib/node_modules/@stdlib/_tools/eslint/rules/require-leading-slash/lib/main.js

@@ -92,6 +92,7 @@ function main( context ) {
 
 rule = {
 	'meta': {
+		'type': 'problem',
 		'docs': {
 			'description': 'disallow `require()` calls of relative paths which do not begin with a leading `./`'
 		},