Changed access modifiers

• Changed access modifiers to public private(set) for session, serviceAdvertiser and serviceBrowser
• Set sendToPeers to public
• Added @discardableResult success boolean to sendToAllPeers and sendToPeers

Optional Delegate

• Delegate is completely optional and default nil in initializer
• All functions in the delegate are optional

Initial Release

First version of this package, open to any feedback, criticisms, pull requests, or even jokes if you have any good ones.