v1.4.0

What's Changed

• Pitchfork gen by @mvandeberg in #217
• Add check_account_nonce mempool rpc by @mvandeberg in #216
• Fix gen cpp by @mvandeberg in #218
• #219: Only checkout a branch if TRAVIS_TAG is not set (not a tag build) by @mvandeberg in #220

Full Changelog: v1.3.0...v1.4.0