Add docs / changelog section for Wagtail 1.5.1

CHANGELOG.txt

@@ -8,6 +8,10 @@ Changelog
  * Image upload form in image chooser now performs client side validation so that the selected file is not lost in the submission (Jack Paine)
 
 
+1.5.1 (xx.xx.xxxx) - IN DEVELOPMENT
+~~~~~~~~~~~~~~~~~~
+
+
 1.5 (31.05.2016)
 ~~~~~~~~~~~~~~~~
 

docs/releases/1.5.1.rst

@@ -0,0 +1,16 @@
+============================================
+Wagtail 1.5.1 release notes - IN DEVELOPMENT
+============================================
+
+.. contents::
+    :local:
+    :depth: 1
+
+
+What's new
+==========
+
+
+Bug fixes
+~~~~~~~~~
+

docs/releases/index.rst

@@ -5,6 +5,7 @@ Release notes
    :maxdepth: 1
 
    1.6
+   1.5.1
    1.5
    1.4.5
    1.4.4