Update changelog for more detail about the impact and possible user actions necessary.

CHANGES.txt

@@ -2,17 +2,22 @@
 CHANGES
 =======
 
-----------
-Unreleased
-----------
+---
+7.0
+---
 
-* Issue #80, #209: Eggs that are downloaded for ``setup_requires``,
-  ``test_requires``, etc. are now placed in a ``.eggs`` directory instead of
-  the package root directory. This is a better place for them as it doesn't
-  cause later phases of setuptools to think that the package is already
-  installed and then not install the package permanently in the environment
-  (See #209).
+* Issue #80, Issue #209: Eggs that are downloaded for ``setup_requires``,
+  ``test_requires``, etc. are now placed in a ``./.eggs`` directory instead of
+  directly in the current directory. This choice of location means the files
+  can be readily managed (removed, ignored). Additionally,
+  later phases or invocations of setuptools will not detect the package as
+  already installed and ignore it for permanent install (See #209).
 
+  This change is indicated as backward-incompatible as installations that
+  depend on the installation in the current directory will need to account for
+  the new location. Systems that ignore ``*.egg`` will probably need to be
+  adapted to ignore ``.eggs``. The files will need to be manually moved or
+  will be retrieved again. Most use cases will require no attention.
 
 ---
 6.1