Fix CHANGELOG

CHANGELOG.rst

@@ -6,14 +6,14 @@ Version 0.5
 ===========
 
 - ``setuptools`` plugin:
-  - Added automatic "update" for deprecated ``tests-require`` key.
-    This value associated with this option is now automatically transformed
-    into a ``testing`` extras group in the ``optional-dependencies``.
-  - Added automatic "expansion" of environment markers inside the extra key in
-    optional-dependencies. According to :pep:`621#dependencies-optional-dependencies`
-    (that points to the core metadata spec), the ``optional-dependencies`` keys
-    must be valid Python identifiers (but ``setuptools`` historically seem to
-    accept markers embedded with ``:`` after the extra name).
+   - Added automatic "update" for deprecated ``tests-require`` key.
+     This value associated with this option is now automatically transformed
+     into a ``testing`` extras group in the ``optional-dependencies``.
+   - Added automatic "expansion" of environment markers inside the extra key in
+     optional-dependencies. According to :pep:`PEP 621 <621#dependencies-optional-dependencies>`
+     (that points to the core metadata spec), the ``optional-dependencies`` keys
+     must be valid Python identifiers (but ``setuptools`` historically seem to
+     accept markers embedded with ``:`` after the extra name).
 - Bumped the version of the ``atoml`` dependency to 1.1.1.
 
 Version 0.4