Added stub release notes for 3.0.8.

docs/releases/3.0.8.txt

@@ -0,0 +1,12 @@
+==========================
+Django 3.0.8 release notes
+==========================
+
+*Expected July 1, 2020*
+
+Django 3.0.8 fixes several bugs in 3.0.7.
+
+Bugfixes
+========
+
+* ...

docs/releases/index.txt

@@ -39,6 +39,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   3.0.8
    3.0.7
    3.0.6
    3.0.5