Hot-recharge

* fixed name error issue on `.rechargeZesa(..)` method

* **BREAKING CHANGE** - constructor now takes a config class arguement for credentials instead of dict of predefined keys
python
import hotrecharge

create config class
config = hotrecharge.HRAuthConfig(
access_code='acc-email',
access_password='acc-pwd',
reference='random-ref'
)

pass config object to api constructor
api = hotrecharge.HotRecharge(config)

* Added recharge EVD `electronic vouchers`
* Added query evds to get all available EVDs
* Can now perform data bundle recharge

* Can now perform zesa recharge operations `api.zesaRecharge(..)`
* Can check zesa customer details from meter number `api.checkZesaCustomer(..)`
* removed `endUserBalance` method
* removed `requests` library on requirements

[1.3.0] - 12 Feb 2021.
* you can now, finally, be able to include `brandID` and CustomerSMS (`mesg`) when making `.rechargePinless(...)` requests

* you can now, finally, be able to include `amount` and CustomerSMS (`mesg`) when making `.dataBundleRecharge(...)` requests

* `NEW` You can now query a previous transaction by its `agentReference` for reconciliation using `.queryTransactionReference(agentRefrence)`
* updated project description
* improved api documentation

[1.2.0] - 9 Mar 2020.
* code refactor
* updated examples and readme

[1.1.0] - 3 Mar 2020.
* Update readme
* set `random_ref` to `True` by default to automatically update request reference

[1.0.0] - 9 Dec 2019.
* Initial release.