Support Swift 5.0

[kiroskirin]

I'm using Carthage and got this error log when build.

Build settings from command line:
    CARTHAGE = YES
    CLANG_ENABLE_CODE_COVERAGE = NO
    CODE_SIGN_IDENTITY = 
    CODE_SIGNING_REQUIRED = NO
    GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = NO
    ONLY_ACTIVE_ARCH = NO
    SDKROOT = iphoneos12.1
    SKIP_INSTALL = YES
    STRIP_INSTALLED_PRODUCT = NO

note: Using new build system
note: Planning build
note: Constructing build description
Build system information
error: SWIFT_VERSION '5.0' is unsupported, supported versions are: 3.0, 4.0, 4.2. (in target 'LanguageManager-iOS')

Build system information
error: SWIFT_VERSION '5.0' is unsupported, supported versions are: 3.0, 4.0, 4.2. (in target 'LanguageManager-iOS')

** ARCHIVE FAILED **```

[kiroskirin]

I know the issue because of my XCode version. Close the issue