Fix http URLs

CHANGELOG.rst

@@ -474,7 +474,7 @@ Changes
   That callable must return a string and is then used for formatting the attribute by the generated ``__repr__()`` method.
   `#568 <https://github.com/python-attrs/attrs/issues/568>`_
 - Added ``attr.__version_info__`` that can be used to reliably check the version of ``attrs`` and write forward- and backward-compatible code.
-  Please check out the `section on deprecated APIs <http://www.attrs.org/en/stable/api.html#deprecated-apis>`_ on how to use it.
+  Please check out the `section on deprecated APIs <https://www.attrs.org/en/stable/api.html#deprecated-apis>`_ on how to use it.
   `#580 <https://github.com/python-attrs/attrs/issues/580>`_
 
  .. _`#425`: https://github.com/python-attrs/attrs/issues/425
@@ -848,7 +848,7 @@ Changes:
 - Accordingly, ``attr.validators.optional()`` now can take a list of validators too.
   `#161 <https://github.com/python-attrs/attrs/issues/161>`_
 - Validators can now be defined conveniently inline by using the attribute as a decorator.
-  Check out the `validator examples <http://www.attrs.org/en/stable/init.html#decorator>`_ to see it in action!
+  Check out the `validator examples <https://www.attrs.org/en/stable/init.html#decorator>`_ to see it in action!
   `#143 <https://github.com/python-attrs/attrs/issues/143>`_
 - ``attr.Factory()`` now has a *takes_self* argument that makes the initializer to pass the partially initialized instance into the factory.
   In other words you can define attribute defaults based on other attributes.