Fix a bug where INTL_IDNA_VARIANT_UTS46 was used while undeclared
The constant was introduced in PHP 5.4, and is documented that way, but it actually depends on PHP being linked to ICU 4.6+, while the minimum requirement for compilation is 4.0 ...
When this happens on PHP 7.2, an E_DEPRECATED notice will be emitted; there's currently a discussion on php-internals to resolve that issue.
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 686f9b8..f743083 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -7,6 +7,12 @@
Release Date: Not Released
+- General Changes
+
+Bug fixes for 3.1.8
+-------------------
+
+- Fixed a bug where :doc:`Form Validation Library <libraries/form_validation>`, :doc:`Email Library <libraries/email>` tried to use ``INTL_IDNA_VARIANT_UTS46`` when it was undeclared.
Version 3.1.7
=============