Version `v3.3.0-solc-0.8`

Version `v3.2.0-solc-0.8`

Version `v3.1.0-solc-0.8`

Merge pull request summa-tx#183 from summa-tx/prepare-npm-publish

Prepare npm publish

Merge pull request summa-tx#183 from summa-tx/prepare-npm-publish

Prepare npm publish

v4.0.0

- TypedMemView replaces BytesLib
- ViewBTC replaces BTCUtils
- ViewSPV replaces ValidateSPV
- significant refactors to CheckBitcoinSigs
- remove Delegate contracts

v3.1.0

- (breaking) remove extractOutputScriptLen
- fix improper payload extraction in extractHash
- fix off-by-one bug when extracting last input/output
- add preview TypedMemView implementation
- lints and doc fixes

- better ser/deser for hex. handles non-0x-prefixed now

- extra verifier for SPVProof merkles

- New JSON format