Add new discussions url to isDiscussion()

Solved: #175

Author: kang8

index.ts

@@ -207,10 +207,12 @@ addTests('isProjects', [
 	'https://github.com/sindresorhus/refined-github/projects',
 ]);
 
-export const isDiscussion = (url: URL | HTMLAnchorElement | Location = location): boolean => /^discussions\/\d+/.test(getRepo(url)?.path ?? getOrg(url)?.path!);
+export const isDiscussion = (url: URL | HTMLAnchorElement | Location = location): boolean => (/^discussions\/\d+/.test(getRepo(url)?.path ?? getOrg(url)?.path!)) || getRepo(url)?.path === 'discussions/new';
 addTests('isDiscussion', [
 	'https://github.com/tophf/mpiv/discussions/50',
 	'https://github.com/orgs/community/discussions/11202',
+	'https://github.com/withastro/roadmap/discussions/new',
+	'https://github.com/withastro/roadmap/discussions/new?category=proposal',
 ]);
 
 export const isDiscussionList = (url: URL | HTMLAnchorElement | Location = location): boolean => getRepo(url)?.path === 'discussions' || getOrg(url)?.path === 'discussions';