Can delete a group conversation

lib/helpers/groups_helper.dart

@@ -361,6 +361,14 @@ class GroupsHelper {
                   .key)
           .execWithThrow();
 
+  /// Delete a group's conversation
+  ///
+  /// Throws in case of failure
+  static Future<void> deleteConversation(int convID) async =>
+      await APIRequest.withLogin("groups/delete_conversation")
+          .addInt("conv_id", convID)
+          .execWithThrow();
+
   /// Turn an API entry into a group object
   Group _getGroupFromAPI(Map<String, dynamic> map) {
     return Group(