Create Asana task in proper section (#19)

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## Which problem is this PR solving?

- Closes #18

## Short description of the changes

Changed API call based on
[this](https://forum.asana.com/t/add-task-to-a-section-upon-creation-via-api-request/51957/4)

## How to verify that this has the expected result

I forked the repository to our private repo with the changes and it's
working fine now.

src/main.ts

@@ -22,7 +22,7 @@ async function run(): Promise<void> {
     await client.tasks.create({
       workspace: workspaceId,
       projects: [projectId],
-      assignee_section: sectionId,
+      memberships: [{ project: projectId, section: sectionId }],
       name: taskName,
       notes: taskDescription,
       due_on: dueDate,