🚀 Merged pull requests

• Swift4 https://github.com/hyperoslo/Whisper/pull/180, by majamusan
• Add circle CI https://github.com/hyperoslo/Whisper/pull/184, by onmyway133
• Update project to Swift 4 https://github.com/hyperoslo/Whisper/pull/185, by onmyway133
• Fix some minor typos and grammar errors in README.md https://github.com/hyperoslo/Whisper/pull/187, by cmilr
• Fixing keyboard visibility bug in WhistleFactory https://github.com/hyperoslo/Whisper/pull/186, by jondwillis
• Refactor iPhone X fix https://github.com/hyperoslo/Whisper/pull/183, by zenangst
• Swift 4 Support https://github.com/hyperoslo/Whisper/pull/175, by barnaclejive
• Fixed incorrect displaying with iPhone X. https://github.com/hyperoslo/Whisper/pull/179, by wowlocal