fix readme links

Author: bckohan

README.rst

@@ -30,8 +30,6 @@
 .. _enumerations: https://docs.python.org/3/library/enum.html#enum.Enum
 .. _ValueError: https://docs.python.org/3/library/exceptions.html#ValueError
 .. _DRY: https://en.wikipedia.org/wiki/Don%27t_repeat_yourself
-.. _enum-properties: https://pypi.org/project/enum-properties
-.. _django-enum: https://django-enum.readthedocs.io/en/latest
 
 Django Enum
 ###########
@@ -40,21 +38,23 @@ Full and natural support for enumerations_ as Django model fields.
 
 Many packages aim to ease usage of Python enumerations as model fields. Most
 were made obsolete when Django provided ``TextChoices`` and ``IntegerChoices``
-types. The motivation for django-enum_ was to:
+types. The motivation for `django-enum <https://django-enum.readthedocs.io/en/latest/>`_
+was to:
 
 * Always automatically coerce fields to instances of the Enum type.
 * Allow strict adherence to Enum values to be disabled.
 * Handle migrations appropriately. (See `migrations <https://django-enum.readthedocs.io/en/latest/usage.html#migrations>`_)
 * Integrate as fully as possible with Django_'s existing level of enum support.
-* Integrate with enum-properties_ to enable richer enumeration types.
+* Integrate with `enum-properties <https://pypi.org/project/enum-properties/>`_ to enable richer enumeration types.
 * Represent enum fields with the smallest possible column type.
 * Be as simple and light-weight an extension to core Django as possible.
 
-django-enum_ works in concert with Django_'s built in ``TextChoices`` and
-``IntegerChoices`` to provide a new model field type, ``EnumField``, that
-resolves the correct native Django_ field type for the given enumeration based
-on its value type and range. For example, ``IntegerChoices`` that contain
-values between 0 and 32767 become `PositiveSmallIntegerField <https://docs.djangoproject.com/en/stable/ref/models/fields/#positivesmallintegerfield>`_.
+`django-enum <https://django-enum.readthedocs.io/en/latest/>`_ works in concert
+with Django_'s built in ``TextChoices`` and ``IntegerChoices`` to provide a
+new model field type, ``EnumField``, that resolves the correct native Django_
+field type for the given enumeration based on its value type and range. For
+example, ``IntegerChoices`` that contain values between 0 and 32767 become
+`PositiveSmallIntegerField <https://docs.djangoproject.com/en/stable/ref/models/fields/#positivesmallintegerfield>`_.
 
 .. code:: python