v0.3.1

Added function to get datetime of profile creation (#3)

* Added function to get datetime of subscription

* fix GetProfileCreatedDate

* add nil check

* remove white space

v0.3.0

Bumped to v0.3.0 (#2)

- Add TransactionSearch API
- Move merchant to client/merchant

v0.2.0

Bumped to v0.2.0 (#1)

- change HTTP client to h2non/gentleman
- change HTTP Method from GET to POST
    - [Discontinue Use of GET Method for Classic APIs
Microsite](https://www.paypal-knowledge.com/infocenter/index?page=conten
t&id=FAQ1927)

v0.1.0

Added feature for GetTransactionDetails