fix(Build): Fix changelog template.

Since conventional-changelog 4.2.0 the previous header is merged to the
end of the new changelog entry block.
This is documented here: release-it/conventional-changelog#46
As long as this issue is not resolved, we're adding a ``#`` at the end
of the changelog block, intending the previous entry in the heading
hierarchy, but that's better than a even more messed up changelog file.

Author: thet

.release-it/conventional-changelog-commit.hbs

@@ -1,6 +1,4 @@
 
-<br>
-
 *{{#if scope}} **{{scope}}:**
 {{~/if}} {{#if subject}}
   {{~subject}}

.release-it/conventional-changelog-template.hbs

@@ -22,5 +22,4 @@
 
 {{/each}}
 
-<br>
-<br>
+#