Only include relevant files in release bundle

By default Cargo includes all files in the crate directory in the
released bundle. That's not only potentially wasteful, it may also
include files that potentially have no business being included (Cargo
typically warns about potential issues, but we have seen at least one
case where that was not enough).
This change adjusts our Cargo.toml to only include relevant files in the
created release bundle.

CHANGELOG.md

@@ -4,6 +4,7 @@ Unreleased
 - Added support for listing nested orders
 - Replaced usage of private `serde` API with inline code
 - Bumped minimum supported Rust version to `1.44`
+- Excluded unnecessary files from being contained in release bundle
 - Replaced `async-tungstenite` dependency with `tokio-tungstenite`
 - Removed `chrono` dependency
 - Bumped `hyper` dependency to `0.14`

Cargo.toml

@@ -18,6 +18,7 @@ keywords = ["trading", "finance", "async", "stocks"]
 description = """
 A create for interacting with the Alpaca API.
 """
+include = ["src/**/*", "LICENSE", "README.*", "CHANGELOG.*"]
 
 [badges]
 gitlab = { repository = "d-e-s-o/apca", branch = "master" }