[ecash-agora] Catch up changelog for next published version

Summary:
We have not published `ecash-agora` (officially) yet, though there is a 0.1.1 rc version on npm.

Lots of work has been going on in the meantime.

It can be useful to have this sort of reference available for an npm user who may not be familiar with searching phab.

Test Plan: Check readme, won't land this until we are going to publish, so pending review of D16944

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D16973

modules/ecash-agora/README.md

@@ -141,3 +141,20 @@ Running from `bitcoin-abc/modules/ecash-agora` if your build dir is `bitcoin-abc
 
 -   0.1.0 - MVP [D16087](https://reviews.bitcoinabc.org/D16087) [D16111](https://reviews.bitcoinabc.org/D16111)
 -   0.1.1 - Upgrading dependencies [D16374](https://reviews.bitcoinabc.org/D16374)
+
+### 0.2.0
+
+-   Add agora.py plugin [D16544](https://reviews.bitcoinabc.org/D16544)
+-   Plugin support [D16745](https://reviews.bitcoinabc.org/D16745)|[D16753](https://reviews.bitcoinabc.org/D16753)|[D16754](https://reviews.bitcoinabc.org/D16754)|[D16755](https://reviews.bitcoinabc.org/D16755)
+-   Improve test framework [D16741](https://reviews.bitcoinabc.org/D16741)
+-   Websocket subscriptions [D16845](https://reviews.bitcoinabc.org/D16845)
+-   Build script for partial SLP offers [D16743](https://reviews.bitcoinabc.org/D16743)
+-   Approximation logic for partial offers [D16735](https://reviews.bitcoinabc.org/D16735)
+-   Add `historicOffers` function to `Agora` [D16819](https://reviews.bitcoinabc.org/D16819)
+-   Patch burned tokens issue in agora partial scripts [D16821](https://reviews.bitcoinabc.org/D16821)
+-   Export partial modules [D16820](https://reviews.bitcoinabc.org/D16820)
+-   Syntax linting [D16919](https://reviews.bitcoinabc.org/D16919)|[D16928](https://reviews.bitcoinabc.org/D16928)
+-   README patch for local integration testing [D16952](https://reviews.bitcoinabc.org/D16952)
+-   Patch minAcceptedTokens() to return true minimum (prepared value) [D16920](https://reviews.bitcoinabc.org/D16920)
+-   Add validation to acceptTx method of AgoraPartial to prevent creation of unspendable offers [D16944](https://reviews.bitcoinabc.org/D16944)
+-   Export `scriptOps` helper function [D16972](https://reviews.bitcoinabc.org/D16972)