Update release history with link from intro

Author: grantjenks

HISTORY.rst

@@ -1,8 +1,14 @@
 Sorted Containers Release History
 =================================
 
+.. contents::
+   :depth: 1
+   :local:
+
 .. currentmodule:: sortedcontainers
 
+.. _v2:
+
 2.0.0 (2018-05-04)
 ------------------
 

docs/introduction.rst

@@ -749,8 +749,7 @@ couple of things to keep in mind.
 
 :doc:`Sorted Containers<index>` went through a major version change between
 version one and version two. The goal of the change was to adopt Python 3
-semantics wherever possible. These changes are detailed on the :doc:`history
-<history>` page but a quick summary follows:
+semantics wherever possible:
 
 1. Several :class:`SortedList` methods now raise :exc:`NotImplementedError`:
    :func:`SortedList.__setitem__`, :func:`SortedList.append`, and
@@ -768,6 +767,10 @@ semantics wherever possible. These changes are detailed on the :doc:`history
    to `SortedKeyList` but an alias remains for compatibility. Several methods
    which accepted a `val` parameter now accept `value` for better readability.
 
+The :doc:`history` documents all the changes made in every version in the
+history of the project. The :ref:`Version 2<v2>` release notes detail all the
+changes made.
+
 The `blist`_ project remains the most similar as its API was the original
 inspiration for :doc:`Sorted Containers<index>`. The main difference has always
 been the :func:`SortedList.pop` method. The `blist`_ project pops the first