------------------------------ - changed name to wechatpay - NOTE: for general usage, please use version 1.0
1.0.8
------------------------------ - changed name to wechatpay - NOTE: for general usage, please use version 1.0
1.0.7
------------------------------ - Added date_validation() in DownloadBill() - NOTE: for general usage, please use version 1.0
1.0.6
------------------------------ - Removed get_access_token() - Updated get_jsapi_ticket() - NOTE: for general usage, please use version 1.0
1.0.5
------------------------------ - Django ORM added in DownloadBill - NOTE: for general usage, please use version 1.0
1.0.4
------------------------------ - Bug fixing. - changed DownloadBill().post() to DownloadBill().get_bill() - NOTE: for general usage, please use version 1.0