Update CHANGELOG and README for 4.x alpha.

CHANGELOG.md

@@ -3,6 +3,11 @@
 Entries are listed in reverse chronological order per undeprecated
 major series.
 
+## 4.x series
+
+* Update the `rand_core` dependency version and the `rand` dev-dependency
+  version.
+
 ## 3.x series
 
 ### 3.1.0

README.md

@@ -45,9 +45,26 @@ make doc-internal
 To import `curve25519-dalek`, add the following to the dependencies section of
 your project's `Cargo.toml`:
 ```toml
-curve25519-dalek = "3"
+curve25519-dalek = "4.0.0-pre.0"
 ```
 
+## Major Version API Changes
+
+See `CHANGELOG.md` for more details.
+
+### 2.x
+
+The `2.x` series has API almost entirely unchanged from the `1.x` series,
+except that:
+
+* an error in the data modeling for the (optional) `serde` feature was
+  corrected, so that when the `2.x`-series `serde` implementation is used
+  with `serde-bincode`, the derived serialization matches the usual X/Ed25519
+  formats;
+* the `rand` version was updated.
+
+### 3.x (current stable)
+
 The sole breaking change in the `3.x` series was an update to the `digest`
 version, and in terms of non-breaking changes it includes:
 
@@ -62,16 +79,12 @@ version, and in terms of non-breaking changes it includes:
   the Coq theorem proving system, and
 * support for explicitly calling the `zeroize` traits for all point types.
 
-The `2.x` series has API almost entirely unchanged from the `1.x` series,
-except that:
+### 4.x (current alpha)
 
-* an error in the data modeling for the (optional) `serde` feature was
-  corrected, so that when the `2.x`-series `serde` implementation is used
-  with `serde-bincode`, the derived serialization matches the usual X/Ed25519
-  formats;
-* the `rand` version was updated.
-
-See `CHANGELOG.md` for more details.
+The `4.x` series has an API largely unchanged from `3.x`, with a breaking change
+to update the `rand` dependency crates.  It also requires including a new trait,
+`use curve25519_dalek::traits::BasepointTable`, whenever using `EdwardsBasepointTable`
+or `RistrettoBasepointTable`.
 
 # Backends and Features
 

src/lib.rs

@@ -22,7 +22,7 @@
 
 #![cfg_attr(feature = "nightly", doc(include = "../README.md"))]
 #![doc(html_logo_url = "https://doc.dalek.rs/assets/dalek-logo-clear.png")]
-#![doc(html_root_url = "https://docs.rs/curve25519-dalek/3.1.0")]
+#![doc(html_root_url = "https://docs.rs/curve25519-dalek/4.0.0-pre.0")]
 
 //! Note that docs will only build on nightly Rust until
 //! [RFC 1990 stabilizes](https://github.com/rust-lang/rust/issues/44732).