Fix CI_Upload errors on PHP 7.1
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 4870cb1..97b4d25 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -21,6 +21,7 @@
- Fixed a bug (#4754) - :doc:`Unit Testing Library <libraries/unit_testing>` method ``result()`` didn't translate ``res_datatype``.
- Fixed a bug (#4759) - :doc:`Form Validation <libraries/form_validation>`, :doc:`Trackback <libraries/trackback>` and `XML-RPC <libraries/xmlrpc>` libraries treated URI schemes in a case-sensitive manner.
- Fixed a bug (#4762) - :doc:`Cache Library <libraries/caching>` 'file' driver method ``get_metadata()`` checked TTL time against ``mtime`` instead of the cache item's creation time.
+- Fixed a bug where :doc:`File Uploading Library <libraries/file_uploading>` generated error messages on PHP 7.1.
Version 3.1.0
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