Fix response types of some timeline methods and add `unlike`

examples/deno/post.ts

@@ -0,0 +1,6 @@
+import { client, login } from "./mod.ts";
+
+await login();
+
+const a = await client.timeline.retrieveFeed();
+console.log(a);

socialvoid/methods/timeline.ts

@@ -32,7 +32,7 @@ export class Timeline extends MethodBase {
    *
    * @param post The ID or instance of the post to be deleted.
    */
-  delete(post: string | Post): Promise<Post> {
+  delete(post: string | Post): Promise<boolean> {
     return this.client.invokeRequest(
       new Request("timeline.delete", {
         post: typeof post === "string" ? post : post.id,
@@ -124,7 +124,7 @@ export class Timeline extends MethodBase {
    *
    * @param post The ID or instance of the post to like.
    */
-  like(post: string | Post): Promise<Post> {
+  like(post: string | Post): Promise<boolean> {
     return this.client.invokeRequest(
       new Request("timeline.like", {
         post: typeof post === "string" ? post : post.id,
@@ -133,6 +133,20 @@ export class Timeline extends MethodBase {
     );
   }
 
+  /**
+   * Likes an existing post on the timeline.
+   *
+   * @param post The ID or instance of the post to like.
+   */
+  unlike(post: string | Post): Promise<boolean> {
+    return this.client.invokeRequest(
+      new Request("timeline.unlike", {
+        post: typeof post === "string" ? post : post.id,
+      }),
+      true,
+    );
+  }
+
   /**
    * Returns an array of posts from the users timeline.
    *