Added stub release notes for security releases.

docs/releases/1.11.19.txt

+============================
+Django 1.11.19 release notes
+============================
+
+*February 11, 2019*
+
+Django 1.11.19 fixes a security issue in 1.11.18.

docs/releases/2.0.11.txt

+===========================
+Django 2.0.11 release notes
+===========================
+
+*February 11, 2019*
+
+Django 2.0.11 fixes a security issue in 2.0.10.

docs/releases/2.1.6.txt

@@ -2,9 +2,9 @@
 Django 2.1.6 release notes
 ==========================
 
-*Expected February 1, 2019*
+*February 11, 2019*
 
-Django 2.1.6 several bugs in 2.1.5.
+Django 2.1.6 fixes a security issue and a bug in 2.1.5.
 
 Bugfixes
 ========

docs/releases/index.txt

@@ -52,6 +52,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   2.0.11
    2.0.10
    2.0.9
    2.0.8
@@ -69,6 +70,7 @@ versions of the documentation contain the release notes for any later releases.
 .. toctree::
    :maxdepth: 1
 
+   1.11.19
    1.11.18
    1.11.17
    1.11.16