Updating README and CHANGELOG

Author: jnape

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 ## [Unreleased]
 
+There are currently no unreleased changes
+
+## [5.4.0] - 2021-09-17
+
 ### Changed
 - `Absent` folds short-circuit on the first `nothing()`
 - `EitherMatcher#isLeftThat/isRightThat` support contravariant bounds on their delegates
@@ -592,7 +596,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 - `Monadic/Dyadic/TriadicFunction`, `Predicate`, `Tuple2`, `Tuple3`
 - `Functor`, `BiFunctor`, `ProFunctor` 
 
-[Unreleased]: https://github.com/palatable/lambda/compare/lambda-5.3.0...HEAD
+[Unreleased]: https://github.com/palatable/lambda/compare/lambda-5.4.0...HEAD
+[5.4.0]: https://github.com/palatable/lambda/compare/lambda-5.3.0...lambda-5.4.0
 [5.3.0]: https://github.com/palatable/lambda/compare/lambda-5.2.0...lambda-5.3.0
 [5.2.0]: https://github.com/palatable/lambda/compare/lambda-5.1.0...lambda-5.2.0
 [5.1.0]: https://github.com/palatable/lambda/compare/lambda-5.0.0...lambda-5.1.0

README.md

@@ -61,14 +61,14 @@ Add the following dependency to your:
 <dependency>
     <groupId>com.jnape.palatable</groupId>
     <artifactId>lambda</artifactId>
-    <version>5.3.0</version>
+    <version>5.4.0</version>
 </dependency>
 ```
 
 `build.gradle` ([Gradle](https://docs.gradle.org/current/userguide/dependency_management.html)):
 
 ```gradle
-compile group: 'com.jnape.palatable', name: 'lambda', version: '5.3.0'
+compile group: 'com.jnape.palatable', name: 'lambda', version: '5.4.0'
 ```
 
 <a name="examples">Examples</a>