Prepare 0.5 release

Author: levlaz

CHANGELOG

@@ -6,7 +6,7 @@ Here you can see the full list of changes between each Nightfall release.
 Version 0.5.0
 -------------
 
-UNRELEASED
+Released on July 12, 2021
 
 - Publish Sphinx docs to GitHub pages
 - Split up unit and integration tests, use mocking for unit tests

docs/changelog.html

@@ -172,7 +172,7 @@ <h1>Changelog<a class="headerlink" href="#changelog" title="Permalink to this he
 <p>Here you can see the full list of changes between each Nightfall release.</p>
 <div class="section" id="version-0-5-0">
 <h2>Version 0.5.0<a class="headerlink" href="#version-0-5-0" title="Permalink to this headline">¶</a></h2>
-<p>UNRELEASED</p>
+<p>Released on July 12, 2021</p>
 <ul class="simple">
 <li><p>Publish Sphinx docs to GitHub pages</p></li>
 <li><p>Split up unit and integration tests, use mocking for unit tests</p></li>