Can delete posts

lib/helpers/posts_helper.dart

@@ -56,6 +56,16 @@ class PostsHelper {
     }
   }
 
+  /// Delete a post
+  Future<bool> delete(int id) async {
+    return (await APIRequest(
+      uri: "posts/delete",
+      needLogin: true,
+      args: {"postID": id.toString()},
+    ).exec())
+        .isOK;
+  }
+
   /// Turn an API entry into a [Post] object
   Post _apiToPost(Map<String, dynamic> map) {
     // Parse comments