Merge pull request cebe#124 from SOHELAHMED7/master

Merge PRs of SOHELAHMED7/yii2-openapi

Merge pull request #97 from Insolita/fix-non-db-model-transformers

 support non-db relations for transformers

Update README.md

support custom parameter naming for model ID

basic support for generating validation rules

add asset-packagist for CI

Update README.md