Added stub release notes for 1.8.7.

docs/releases/1.8.7.txt

@@ -0,0 +1,12 @@
+==========================
+Django 1.8.7 release notes
+==========================
+
+*Under development*
+
+Django 1.8.7 fixes several bugs in 1.8.6.
+
+Bugfixes
+========
+
+* ...

docs/releases/index.txt

@@ -39,6 +39,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   1.8.7
    1.8.6
    1.8.5
    1.8.4