Add require-funding rule

Author: ntwb

lib/npm-package-json-lint-config.js

@@ -17,6 +17,7 @@ module.exports = {
 		'require-author': 'error',
 		'require-description': 'error',
 		'require-engines': 'error',
+		'require-funding': 'error',
 		'require-keywords': 'error',
 		'require-license': 'error',
 		'require-main': 'error',