chore: prepare v0.2.0 release

Bundles everything since v0.1.2 into a single v0.2.0 release (the
v0.2.1 tag from the prior history has been dropped; the paginate
fix and test-cleanup it would have carried are folded in here).

Added:
- Longbridge.QuoteContext.candlesticks_paginated/3 — paginated K-line
  fetch with dedup-by-timestamp and oldest-first ordering.

Fixed:
- mix credo --strict FunctionArity on paginate/9 — collapsed the
  loop-state args (acc, seen) into a single state map.
- README cancel_order/2 example — pattern-match {:ok, map()} per @SPEC.

Author: gilbertwong96

CHANGELOG.md

@@ -5,6 +5,30 @@ All notable changes to this project are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.2.0]
+
+### Added
+
+- **`Longbridge.QuoteContext.candlesticks_paginated/3`** — fetch up to N
+  K-line bars across multiple `candlesticks/3` calls. Deduplicates by
+  timestamp to avoid infinite loops when the API returns the same recent
+  bars on every call (e.g. paper-trading accounts where the historical
+  window is unavailable), and returns candles sorted oldest-first.
+  Rate-limited by the SDK's connection-level throttle.
+
+### Fixed
+
+- **`mix credo --strict` `FunctionArity` finding** —
+  `Longbridge.QuoteContext.paginate/9` took 9 parameters, exceeding
+  the max-8 limit and causing the strict Credo run to exit with rc=8.
+  The two loop-state arguments (`acc`, `seen`) have been collapsed
+  into a single `state` map, dropping the arity to 8. Public API is
+  unchanged.
+- **README `Longbridge.TradeContext.cancel_order/2` example** — the
+  install/quickstart snippet destructured the return as `:ok`; the
+  function's `@spec` returns `{:ok, map()}`. The snippet now pattern-
+  matches the actual tuple shape.
+
 ## [0.1.2]
 
 ### Changed
@@ -119,6 +143,8 @@ The SDK is feature-complete against the upstream protocol for the pinned
 - `Longbridge.TradeContext`: 95.9%.
 - `Longbridge.QuoteContext.RealtimeStore`: 100%.
 
+[0.2.1]: https://github.com/gilbertwong96/longbridge/compare/v0.2.0...v0.2.1
+[0.2.0]: https://github.com/gilbertwong96/longbridge/compare/v0.1.2...v0.2.0
 [0.1.2]: https://github.com/gilbertwong96/longbridge/compare/v0.1.1...v0.1.2
 [0.1.1]: https://github.com/gilbertwong96/longbridge/compare/v0.1.0...v0.1.1
 [0.1.0]: https://github.com/gilbertwong96/longbridge/releases/tag/v0.1.0

README.md

@@ -19,7 +19,7 @@ Add `longbridge` to your `mix.exs`:
 ```elixir
 def deps do
   [
-    {:longbridge, "~> 0.1.2"}
+    {:longbridge, "~> 0.2.0"}
   ]
 end
 ```

mix.exs

@@ -4,7 +4,7 @@ defmodule Longbridge.MixProject do
   def project do
     [
       app: :longbridge,
-      version: "0.1.2",
+      version: "0.2.0",
       elixir: "~> 1.20",
       start_permanent: Mix.env() == :prod,
       package: package(),