Add release notes for 1.12.4 - 1.12.6 and 1.13.2 - 1.13.4

Conflicts:
	CHANGELOG.txt
	docs/releases/index.rst

Conflicts:
	CHANGELOG.txt
	docs/releases/index.rst

CHANGELOG.txt

@@ -211,6 +211,12 @@ Changelog
  * Fix: Prevent style leak of Wagtail panel icons in widgets using ``h2`` elements (THibaud Colas)
 
 
+1.13.4 (13.08.2018)
+~~~~~~~~~~~~~~~~~~~
+
+ * Fix: Pin Beautiful Soup to 4.6.0 due to further regressions in formatting empty elements (Matt Westcott)
+
+
 1.13.3 (13.08.2018)
 ~~~~~~~~~~~~~~~~~~~
 
@@ -271,6 +277,12 @@ Changelog
  * Fix: API listing views no longer fail when no site records are defined (Karl Hobley)
 
 
+1.12.6 (13.08.2018)
+~~~~~~~~~~~~~~~~~~~
+
+ * Fix: Pin Beautiful Soup to 4.6.0 due to further regressions in formatting empty elements (Matt Westcott)
+
+
 1.12.5 (13.08.2018)
 ~~~~~~~~~~~~~~~~~~~
 

docs/releases/1.12.6.rst

@@ -0,0 +1,16 @@
+============================
+Wagtail 1.12.6 release notes
+============================
+
+.. contents::
+    :local:
+    :depth: 1
+
+
+What's new
+==========
+
+Bug fixes
+~~~~~~~~~
+
+ * Pin Beautiful Soup to 4.6.0 due to further regressions in formatting empty elements (Matt Westcott)

docs/releases/1.13.4.rst

@@ -0,0 +1,16 @@
+============================
+Wagtail 1.13.4 release notes
+============================
+
+.. contents::
+    :local:
+    :depth: 1
+
+
+What's new
+==========
+
+Bug fixes
+~~~~~~~~~
+
+ * Pin Beautiful Soup to 4.6.0 due to further regressions in formatting empty elements (Matt Westcott)

docs/releases/index.rst

@@ -12,10 +12,12 @@ Release notes
    2.1
    2.0.1
    2.0
+   1.13.4
    1.13.3
    1.13.2
    1.13.1
    1.13
+   1.12.6
    1.12.5
    1.12.4
    1.12.3