Bump to 2.6.4

CHANGELOG.md

@@ -1,4 +1,4 @@
-## 2.6.4 (unreleased)
+## 2.6.4
 
   - [#181](https://github.com/airblade/paper_trail/issues/181)/[#182](https://github.com/airblade/paper_trail/pull/182) -
     Controller metadata methods should only be evaluated when `paper_trail_enabled_for_controller == true`.
@@ -14,4 +14,4 @@
   - [#167](https://github.com/airblade/paper_trail/pull/167) - Fix `originator` method so that it works with subclasses and STI.
   - [#160](https://github.com/airblade/paper_trail/pull/160) - Fixed failing tests and resolved out of date dependency issues.
   - [#157](https://github.com/airblade/paper_trail/pull/157) - Refactored `class_attribute` names on the `ClassMethods` module
-    for names that are not obviously pertaining to PaperTrail to prevent method name collision.
+    for names that are not obviously pertaining to PaperTrail to prevent method name collision.

lib/paper_trail/version_number.rb

@@ -1,3 +1,3 @@
 module PaperTrail
-  VERSION = '2.6.3'
+  VERSION = '2.6.4'
 end