Update Siren.swift (#254)
Update Siren.swift (#254)

* Update Siren.swift

- fixed url session caching issue in performVersionCheck().

* Update Siren.swift

- swapped .reloadIgnoringCacheData caching policy with .reloadIgnoringLocalAndRemoteCacheData in performVersionCheck() method.

ArtSabintsev/Siren,ArtSabintsev/Siren