fix(ObjectSerializer): pass to_json arguments (jsonapi-serializer#80)

* fix(ObjectSerializer): pass to_json arguments

to_json takes arguments that serialized_json did not define.  This breaks a lot of things.

* Update CHANGELOG.md with latest fix and release

- Serializer option support for procs (jsonapi-serializer#32)

- JSON serialization API method is now implementable (jsonapi-serializer#44)

- Support for polymorphic `id_method_name` (jsonapi-serializer#17)
- Relationships support for `&:proc` syntax (jsonapi-serializer#58)
- Conditional support for procs (jsonapi-serializer#59)
- Attribute support for procs (jsonapi-serializer#67)
- Refactor caching support (jsonapi-serializer#52)
- `is_collection?` is safer for objects (jsonapi-serializer#18)

- `serialized_json` is now deprecated (jsonapi-serializer#44)

Merge pull request #342 from Netflix/release-1.5

Release 1.5

Merge pull request #320 from Netflix/release-1.4

Release 1.4

Merge pull request #273 from Netflix/release-1.3

Release 1.3

bump up version to 1.2

Merge branch 'hotfix-1.1.1'

merging with release-1.1

bump gemspec version