Release v0.4.0

Changelog

• 5b74cee Bump codecov/codecov-action from 3.1.1 to 3.1.2
• 901c3d0 Bump codecov/codecov-action from 3.1.2 to 3.1.3
• 4d584b7 Bump codecov/codecov-action from 3.1.3 to 3.1.4
• f1500e1 Bump github.com/libsv/go-bt/v2 from 2.2.0 to 2.2.1
• dcd429b Bump github.com/stretchr/testify from 1.8.2 to 1.8.3
• 5f00842 Bump github.com/stretchr/testify from 1.8.3 to 1.8.4
• cab25b1 Bump goreleaser/goreleaser-action from 4.2.0 to 4.3.0
• 533c1e4 Fixed go version
• 2f9e99f Fixed reference to tx
• 71db1ed Lots of test cleanup, colliding package name etc
• 6e20ee1 Merge pull request #60 from BitcoinSchema/dependabot/go_modules/master/github.com/libsv/go-bt/v2-2.2.1
• 531e674 Merge pull request #61 from BitcoinSchema/dependabot/github_actions/master/codecov/codecov-action-3.1.2
• 8cb5033 Merge pull request #62 from BitcoinSchema/dependabot/github_actions/master/codecov/codecov-action-3.1.3
• 0659ffc Merge pull request #63 from BitcoinSchema/dependabot/github_actions/master/codecov/codecov-action-3.1.4
• 044adaf Merge pull request #64 from BitcoinSchema/dependabot/go_modules/master/github.com/stretchr/testify-1.8.3
• 9c40f6d Merge pull request #65 from BitcoinSchema/dependabot/go_modules/master/github.com/stretchr/testify-1.8.4
• 3d30f16 Merge pull request #66 from BitcoinSchema/dependabot/github_actions/master/goreleaser/goreleaser-action-4.3.0
• 67ed22b Minor fixes and cleanup
• b6821d7 Minor spelling fix, minor cleanup
• 3c23c50 Not a prerelease anymore :/
• 21a0b34 The BPU struct name changed, lots of cleanup
• 79a12b8 Updated linter
• d17477d Upgraded deps, cleaned up