fix changelog validation (idk either)

src/v2/interfaces/posts.ts

@@ -4,11 +4,14 @@ export type PostDownload =
 	| Record<string, Record<string, string>> // each category: names -> links
 	| Record<string, string>; // just names -> links
 
-export interface PostChangelog {
-	// recursive type so we need an interface (idk why either blame typescript)
-	[key: string]: PostChangelog | string;
+interface NestedChangelog {
+	// recursive type (can be arbitrarily grouped)
+	[key: string]: NestedChangelog | string | string[];
 }
 
+// workaround for index signatures not being supported by validation
+export type PostChangelog = Record<string, NestedChangelog>;
+
 export interface CreateWebsitePost {
 	title: string; // Post main title
 	permalink: string; // link to the post