Merge pull request #933 from wrightlabs/patch-1

Add Security class to list of core classes in docs
diff --git a/user_guide_src/source/general/core_classes.rst b/user_guide_src/source/general/core_classes.rst
index ac41407..4aa6693 100644
--- a/user_guide_src/source/general/core_classes.rst
+++ b/user_guide_src/source/general/core_classes.rst
@@ -31,6 +31,7 @@
 -  Log
 -  Output
 -  Router
+-  Security
 -  URI
 -  Utf8