swift 4 updates

Author: PhamBaTho

Diff for: README.md

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+**I WILL BE BACK NEXT WEEK (LATE SEP 2018) WITH XCODE 10 AND SWIFT 4.2 SUPPORTED. STAY TUNED. APOLOGIZE FOR ANY INCONVINIENCE CAUSED.**
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 ![alt tag](https://github.com/PhamBaTho/BTNavigationDropdownMenu/blob/master/Assets/BTNavigationDropdownLogo.png)
 
 [![Pod Version](https://img.shields.io/cocoapods/v/BTNavigationDropdownMenu.svg?style=flat)](http://cocoadocs.org/docsets/BTNavigationDropdownMenu/)