Version bump to 0.4.0 [skip ci]

Author: ankane

CHANGELOG.md

@@ -1,4 +1,4 @@
-## 0.4.0 (unreleased)
+## 0.4.0 (2024-07-28)
 
 - Added support for SQLx 0.8
 - Dropped support for SQLx < 0.8

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pgvector"
-version = "0.3.4"
+version = "0.4.0"
 description = "pgvector support for Rust"
 repository = "https://github.com/pgvector/pgvector-rust"
 license = "MIT OR Apache-2.0"

README.md

@@ -28,7 +28,7 @@ Or check out some examples:
 Add this line to your application’s `Cargo.toml` under `[dependencies]`:
 
 ```toml
-pgvector = { version = "0.3", features = ["postgres"] }
+pgvector = { version = "0.4", features = ["postgres"] }
 ```
 
 Enable the extension
@@ -84,9 +84,11 @@ let embedding: Option<Vector> = row.get(0);
 Add this line to your application’s `Cargo.toml` under `[dependencies]`:
 
 ```toml
-pgvector = { version = "0.3", features = ["sqlx"] }
+pgvector = { version = "0.4", features = ["sqlx"] }
 ```
 
+For SQLx < 0.8, use `version = "0.3"` and [this readme](https://github.com/pgvector/pgvector-rust/blob/v0.3.4/README.md).
+
 Enable the extension
 
 ```rust
@@ -141,7 +143,7 @@ let embedding: Vector = row.try_get("embedding")?;
 Add this line to your application’s `Cargo.toml` under `[dependencies]`:
 
 ```toml
-pgvector = { version = "0.3", features = ["diesel"] }
+pgvector = { version = "0.4", features = ["diesel"] }
 ```
 
 And update your application’s `diesel.toml` under `[print_schema]`: