v0.1.0-beta.3

Milestone 2 - Provide abstraction that will allow the creation of your own base implementation.

https://github.com/blockcoders/harmony-marketplace-sdk/milestone/2?closed=1

• Add support for HD Wallet-enabled
• Add batch functions for Erc721 and Erc1155 interfaces
• Integration tests with harmony testnet to verify the correct functionality.
• Added inline documentation.