Oracle enhanced adapter 5.2.0 has been released

[Yasuo Honda]

Hi,

I'm excited to announce that Oracle enhanced adapter 5.2.0

has been released on the same day as Rails 5.2. 

Please install and run your applications by updating your Gemfile as follows.

```

gem "activerecord-oracle_enhanced-adapter", "~> 5.2.0"

```

For all changes and fixes please read the following document.

https://github.com/rsim/oracle-enhanced/blob/release52/History.md

Thanks for all who tested, reported issues and opened pull requests

to the RC version of Oracle enhanced adapter 5.2.

Thanks,

--

Yasuo Honda