Compatible with Swift 5 and Xcode 10.2+
Fixed
- Update deprecated index(of:) to firstIndex(of:) (#156)
- Remove ImplicitlyUnwrappedOptional to be compatible with Swift 5.
Improved
- Update project configuration to be compatible with Swift 5 and Xcode 10.2+
- Use system font as default value of
navigationBarTitleFont.