Prepare for release v0.4.0 (#1268)

Author: chrisrink10

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+## [v0.4.0]
 ### Added
  * Added support for referring imported Python names as by `from ... import ...` (#1154)
  * Added the `basilisp.url` namespace for structured URL manipulation (#1239)
@@ -732,6 +734,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Basilisp language and compiler base.
 
+[v0.4.0]: https://github.com/basilisp-lang/basilisp/compare/v0.3.8..v0.4.0
 [v0.3.8]: https://github.com/basilisp-lang/basilisp/compare/v0.3.7..v0.3.8
 [v0.3.7]: https://github.com/basilisp-lang/basilisp/compare/v0.3.6..v0.3.7
 [v0.3.6]: https://github.com/basilisp-lang/basilisp/compare/v0.3.5..v0.3.6

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "basilisp"
-version = "0.3.8"
+version = "0.4.0"
 description = "A Clojure-like lisp written for Python"
 authors = ["Christopher Rink <chrisrink10@gmail.com>"]
 license = "Eclipse Public License 1.0 (EPL-1.0)"