Add 2.1.3 release notes

Author: vsalvino

docs/releases/index.rst

@@ -25,6 +25,7 @@ Supported Versions:
 .. toctree::
     :maxdepth: 1
 
+    v2.1.3
     v2.1.2
     v2.1.1
     v2.1.0

docs/releases/v2.1.3.rst

@@ -0,0 +1,18 @@
+v2.1.3 release notes
+====================
+
+Bug fixes:
+
+* Fix HTML syntax error in film strip.
+
+* Fix HTML syntax error in quote blocks.
+
+* Fix error creating Classifiers when the name is over 50 characters.
+
+* Require Wagtail admin permission for import views.
+
+
+Thank you!
+----------
+
+Thanks to everyone who contributed to `2.1.3 on GitHub <https://github.com/coderedcorp/coderedcms/milestone/48?closed=1>`_.