Release v0.5.4

The only crate that was released was `diesel_codegen`, which contains
no changes other than 24a45c9.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef5dbc9..24318a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 
 ## Unreleased
 
+## [0.5.4] 2016-03-23
+
+* Updated `diesel_codegen` to allow syntex versions up to 0.30.0.
+
 ## [0.5.3] 2016-03-12
 
 ### Added
diff --git a/diesel_codegen/Cargo.toml b/diesel_codegen/Cargo.toml
index 6d6eaff..7057c20 100644
--- a/diesel_codegen/Cargo.toml
+++ b/diesel_codegen/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "diesel_codegen"
-version = "0.5.2"
+version = "0.5.4"
 authors = ["Sean Griffin <sean@seantheprogrammer.com>"]
 license = "MIT OR Apache-2.0"
 build = "build.rs"