Include apca crate in README

Include the apca crate in the listing of "Finance" crates in the README.
The crate provides bindings to the Alpaca trading and realtime data APIs
offered by https://alpaca.markets/

README.md

@@ -1270,6 +1270,7 @@ See also [About Rust’s Machine Learning Community](https://medium.com/@autumn_
 ### Finance
 
 * [avhz/RustQuant](https://github.com/avhz/RustQuant) [[RustQuant](https://crates.io/crates/RustQuant)] — A quantitative finance library. ![GitHub Workflow Status (with event)](https://img.shields.io/github/actions/workflow/status/avhz/RustQuant/build.yml)
+* [d-e-s-o/apca](https://github.com/d-e-s-o/apca) [[apca](https://crates.io/crates/apca)] — Opinionated and comprehensive bindings to the [Alpaca API](https://alpaca.markets/) for stock trading and more. ![GitHub Workflow Status](https://github.com/d-e-s-o/apca/actions/workflows/test.yml/badge.svg?branch=main)
 
 ### Functional Programming