add v0.2.0
fix 価格情報の設定が行われていなかった問題を修正
Merge branch 'feature/billingSystem' into develop
fix importの誤りを修正
Revert "fix importの誤りを修正"

This reverts commit 70dcc1363f29444b0de24e914011363db0b1e0bf.
Merge branch 'release/release-0.2.0'