Xcode 13 and 14 compiling issues

[JiangYiWork]

##Xcode 13.x
github "DeclarativeHub/ReactiveKit" == 3.19.0
Xcode 13 is fine with compiling. No issues.

But, if we upgrade ReactiveKit to 3.19.1, then Xcode will stop us as below error:

##Xcode 14.x
github "DeclarativeHub/ReactiveKit" == 3.19.0
Xcode 13 is not able to compile with below error:

After upgrade ReactiveKit to 3.19.1, we will not able to compile neither.

[srdanrasic]

How are you using ReactiveKit? I haven't observed these issues neither in Xcode 13 nor 14.1.

The issues seems to be minor, so maybe you could open a PR with a fix?