Merge rust-bitcoin/rust-bitcoin#2651: units: Release tracking PR: `0.1.0` - BOOM!

a05da2294e units: Add an initial changelog (Tobin C. Harding)
36ef4a62cf units: Improve re-exports (Tobin C. Harding)

Pull request description:

  In preparation for release do two things:

  - Patch 1: Attempt to improve the re-exports and HTML docs
  - Patch 2: Add an initial changelog file

  Note the version number is set already and does not conflict with the current `v0.0.0` version: https://crates.io/crates/bitcoin-units

ACKs for top commit:
  sanket1729:
    utACK a05da2294e
  apoelstra:
    ACK a05da2294e

Tree-SHA512: ab78f89d2e29e58e840d64889f0b7e0e57335e610b8759490478511854f1a7606e8203e4201872eaeb16a96fc527ecdca35e13b39027218d8f71290591e68101

units/CHANGELOG.md

@@ -0,0 +1,17 @@
+# 0.1.0 - Initial Release - 2024-04-03
+
+Initial release of the `bitcoin-units` crate. These unit types are
+integer wrapper types used by the `rust-bitcoin` ecosystem. Note
+please that this release relies heavily on the "alloc" feature.
+
+The main types are:
+
+- `Amount`
+- `locktime::absolute::{Height, Time}`
+- `locktime::relative::{Height, Time}`
+- `FeeRate`
+- `Weight`
+
+# 0.0.0 - Placeholder release
+
+Empty crate to reserve the name on crates.io

units/src/lib.rs

@@ -46,9 +46,16 @@ pub mod parse;
 pub mod weight;
 
 #[doc(inline)]
-pub use self::amount::{Amount, ParseAmountError, SignedAmount};
+pub use self::amount::{Amount, SignedAmount};
+pub use self::amount::ParseAmountError;
 #[cfg(feature = "alloc")]
 pub use self::parse::ParseIntError;
+#[cfg(feature = "alloc")]
+#[doc(inline)]
+pub use self::{
+    fee_rate::FeeRate,
+    weight::Weight,
+};
 
 #[rustfmt::skip]
 #[allow(unused_imports)]