close #416; Update CHANGELOG and README w/ instructions on how to use the new config option for SerializedAttribute support

CHANGELOG.md

@@ -11,10 +11,12 @@ PaperTrail::Rails::Engine.eager_load!
   - [#438](https://github.com/airblade/paper_trail/issues/438) - `Model.paper_trail_enabled_for_model?` should return `false` if
     `has_paper_trail` has not been declared on the class.
   - [#427](https://github.com/airblade/paper_trail/pull/427) - Fix `reify` method in context of model where a column has been removed.
+  - [#416](https://github.com/airblade/paper_trail/issues/416) - Added a `config` option for enabling/disabling
+    utilization of `serialized_attributes` for `ActiveRecord`, necessary because `serialized_attributes` has been
+    deprecated in `ActiveRecord` version `4.2` and will be removed in version `5.0`
   - [#414](https://github.com/airblade/paper_trail/issues/414) - Fix functionality `ignore` argument to `has_paper_trail`
     in `ActiveRecord` 4.
-  - [#399](https://github.com/airblade/paper_trail/pull/399) - Add `:dup` argument for options hash to `reify` which forces a
+  - [#399](https://github.com/airblade/paper_trail/pull/399) - Add `:dup` argument for options hash to `reify` which forces a new model instance.
-    new model instance.
   - [#394](https://github.com/airblade/paper_trail/pull/394) - Add RSpec matcher `have_a_version_with` for easier testing.
   - [#391](https://github.com/airblade/paper_trail/issues/391) - `object_changes` value should dump to `YAML` as a normal `Hash`
     instead of an `ActiveSupport::HashWithIndifferentAccess`.

README.md

@@ -943,6 +943,23 @@ A valid serializer is a `module` (or `class`) that defines a `load` and `dump` m
 * [PaperTrail::Serializers::YAML](https://github.com/airblade/paper_trail/blob/master/lib/paper_trail/serializers/yaml.rb) - Default
 * [PaperTrail::Serializers::JSON](https://github.com/airblade/paper_trail/blob/master/lib/paper_trail/serializers/json.rb)
 
+## SerializedAttributes support
+
+PaperTrail has a config option that can be used to enable/disable whether PaperTrail attempts to utilize
+`ActiveRecord`'s `serialized_attributes` feature. Note: This is enabled by default when PaperTrail is used
+with `ActiveRecord` version < `4.2`, and disabled by default when used with ActiveRecord `4.2.x`. Since
+`serialized_attributes` will be removed in `ActiveRecord` version `5.0`, this configuration value
+has no functionality when PaperTrail is used with version `5.0` or greater.
+
+```ruby
+# Enable support
+>> PaperTrail.config.serialized_attributes = true
+# Disable support
+>> PaperTrail.config.serialzied_attributes = false
+# Get current setting
+>> PaperTrail.serialized_attributes?
+```
+
 ## Limiting the number of versions created per object instance
 
 If you are wary of your `versions` table growing to an unwieldy size, or just don't care to track more than a certain number of versions per object,