v2022.2.9

This is the latest release to support python 3.6

Major changes includes:

• added bech32m
• added Taproot support
• introduced ScriptPubKey class
• used script_type instead of prefix/wit_ver for b58/b32 address functions
• split up op_int in op_num and op_int
• prevented bip32 account derivation with arbitrarily high index
• ensured der.Sig.r is congruent to a valid x-coordinate
• renamed ScriptToken as Command
• moved witness and script_pub_key into script folder
• removed dataclasses_json dependency
• introduced submodules
• renamed Tx.tx_id as Tx.id
• renamed deserialize as parse
• renamed signature functions: trailing underscore marks hash-reduced versions
• updated BIP32 test vectors
• moved continuous testing from TravisCI to Github Actions
• simplified configuration files
• fixed pylint and flake8 warnings