Bump version to 0.23.0

This change bumps the crate to version 0.23.0. The following notable
changes have been made since 0.22.5:
- Added support for subscribing to realtime quotes in addition to
  aggregate bar data
- Adjusted data API request types to include optional data feed to use
- Adjusted data::v2::last_quote::Get to accept a LastQuoteReq object
- Added Crypto variant to api::v2::asset::Class enum and made it
  non-exhaustive
- Added Otc variant to api::v2::asset::Exchange enum and made it
  non-exhaustive
- Introduced api::v2::order::Status::is_terminal method
- Replaced infallible From<Into<String>> conversion for
  asset::Symbol with fallible TryFrom
- Made members of ApiInfo publicly accessible and added more URL
  members
- Renamed various 422 HTTP status error variants to InvalidInput
- Changed various limit types to usize
- Changed api::v2::orders::OrdersReq::limit to be an Option
- Added example illustrating how to stream realtime market data

CHANGELOG.md

@@ -1,5 +1,5 @@
-Unreleased
-----------
+0.23.0
+------
 - Added support for subscribing to realtime quotes in addition to
   aggregate bar data
 - Adjusted data API request types to include optional data feed to use

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "apca"
-version = "0.22.5"
+version = "0.23.0"
 edition = "2021"
 authors = ["Daniel Mueller <deso@posteo.net>"]
 license = "GPL-3.0-or-later"