Hathorlib

What's Changed

* feat: a transaction with some data script outputs now should be a standard tx in https://github.com/HathorNetwork/python-hathorlib/pull/14

What's Changed
* chore: replace flake9 with flake8 in https://github.com/HathorNetwork/python-hathorlib/pull/11
* chore: fix make check command on README in https://github.com/HathorNetwork/python-hathorlib/pull/13
* fix: handle hathor-core errors when submitting blocks in https://github.com/HathorNetwork/python-hathorlib/pull/10