updated to version 0.1.5
see installed news.md
## 0.1.5 - 2022-09-22

### Improvements

* `Datasets::PMJTDatasetList`: Added.
[GitHub#107][Patch by okadak]

* `Datasets::AozoraBunko`: Added.
[GitHub#108][Patch by Masa]

* Added how to develop to README
[GitHub#117][Patch by abcdefg-1234567]

* `Datasets::FuelEconomy`: Added.
[GitHub#114][Patch by Benson Muite]

* `Datasets::Geolonia`: Added.
[GitHub#118][Patch by abcdefg-1234567]

* `Datasets::Diamonds`: Added.
[GitHub#110][Patch by Benson Muite]

* `Datasets::ITACorpus`: Added.
[GitHub#119][Patch by abcdefg-1234567]

* `Datasets::KuzushijiMNIST`: Added.
[GitHub#125][Patch by abcdefg-1234567]

* Updated list of datasets in README.
[GitHub#129][Patch by Benson Muite]

* `Datasets::CaliforniaHousing`: Added.
[GitHub#123][Patch by Benson Muite]

* Added support for Ruby 3.1.
[GitHub#130][Patch by Benson Muite]

* `Datasets::AFINN`: Added.
[GitHub#120][Patch by Benson Muite]

* `Datasets::LivedoorNews`: Added.
[GitHub#127][Patch by abcdefg-1234567]

* `Datasets::SeabornDataList`: Added.
[GitHub#134][Patch by Hirokazu SUZUKI]

* `Datasets::WikipediaKyotoJapaneseEnglish`: Added.
[GitHub#135][Patch by abcdefg-1234567]

* Renamed Rdatasets to Rdataset.
[GitHub#148][Patch by Hirokazu SUZUKI]

* Removed support for Ruby 2.6.

* Add missing license information.

* `Datasets::QuoraDuplicateQuestionPair`: Added.
[GitHub#149][Patch by otegami]

### Fixes

* Fixed key from nil to :index in `Datasets::SeabornData`.
[GitHub#133][Patch by Hirokazu SUZUKI]

* Fixed `Datasets::Rdatasets#each` to change "NA" to nil.
[GitHub#139][Patch by Hirokazu SUZUKI]

* Fix `Datasets::Rdatasets#each` with mixed data of numeric and string.
[GitHub#140][Patch by Hirokazu SUZUKI]

### Thanks

* okadak

* Masa

* Benson Muite

* abcdefg-1234567

* Hirokazu SUZUKI

* Sutou Kouhei

* otegami