Final 0.3 release (pre): add note to README, and update version number
diff --git a/Cargo.toml b/Cargo.toml
index e6ab443..62dc571 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
[package]
name = "rand"
-version = "0.3.20"
+version = "0.3.21-pre.0"
authors = ["The Rust Project Developers"]
license = "MIT/Apache-2.0"
readme = "README.md"
diff --git a/README.md b/README.md
index cd4ee24..97368e1 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,11 @@
[Documentation](https://docs.rs/rand)
+## Compatibility upgrade
+
+Version 0.3 has been replaced by a compatibility wrapper around `rand` 0.4. It
+is recommended to update to 0.4.
+
## Usage
Add this to your `Cargo.toml`:
