bump version and add release notes for 5.0.6

Bugzilla/Constants.pm

@@ -200,7 +200,7 @@ use Memoize;
 # CONSTANTS
 #
 # Bugzilla version
-use constant BUGZILLA_VERSION => "5.0.4+";
+use constant BUGZILLA_VERSION => "5.0.6";
 
 # A base link to the current REST Documentation. We place it here
 # as it will need to be updated to whatever the current release is.

template/en/default/pages/release-notes.html.tmpl

@@ -43,6 +43,10 @@
 
 <h2 id="point">Updates in this 5.0.x Release</h2>
 
+<h3>5.0.6</h3>
+<p>This release contains a schema change to the flagtypes table, allowing for many more flagtypes.</p>.
+<p>The flagtypes table should have been using a mediumint for several releases, but due to a bug in the schema migration code this never happened.</p>
+
 <h3>5.0.5</h3>
 
 <p>This release reformats the code according to the same conventions as the popular Mojolicious product and includes a <code>.perltidyrc</code> to do the same.