Transaction pre protocol 13

[Kirbyrawr]

Types of changes

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [X] I have read the CONTRIBUTING document.
• [X] My code follows the code style of this project.
• [X] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have added tests to cover my changes.
• [X] All new and existing tests passed.

[coveralls]

Coverage increased (+0.1%) to 84.948% when pulling 84df4426ea6171b5edb1bffb405e5b35987b2b95 on transaction-pre-protocol-13 into 80a95ba9669867e194a71bef36f113d1d6949e27 on protocol-13.