Oracle enhanced adapter 6.1.0 has been released

[Yasuo Honda]

Hi, Oracle enhanced adapter 6.1.0 has been released.

This release supports Rails 6.1.0. Please install and test with your
applications by updating your
Gemfile as follows.

```
gem "activerecord-oracle_enhanced-adapter", "~> 6.1.0"
```

## 6.1.0 / 2020-12-15

* Changes and bug fixes
* Support Rails 6.1.0
* Update bug report templates for Oracle enhanced adapter 6.1 [#2063]
* Use released version of rake [#2065 #2066]
* Add /*+ OPTIMIZER_FEATURES_ENABLE('11.2.0.2') */ hint to address
slow SCHEMA queries [#2055, #2068]
* `build_subselect` does not have ordering [#2070]
* Remove `visit_Arel_Nodes_NotIn` and `visit_Arel_Nodes_In` visitors
[#2075, #2077]
* `NOT IN` clause needs separated by `AND` [#2079, #2081]

--
Yasuo Honda