Linux changes

Author: Jimmy Arts

Sources/Base64.swift

@@ -4,7 +4,7 @@ import Foundation
 /// URI Safe base64 encode
 func base64encode(_ input:Data) -> String {
   let data = input.base64EncodedData(options: NSData.Base64EncodingOptions(rawValue: 0))
-  let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) as! String
+  let string = String(describing: NSString(data: data, encoding: String.Encoding.utf8.rawValue))
   return string
     .replacingOccurrences(of: "+", with: "-", options: NSString.CompareOptions(rawValue: 0), range: nil)
     .replacingOccurrences(of: "/", with: "_", options: NSString.CompareOptions(rawValue: 0), range: nil)

Sources/JWT.swift

@@ -81,7 +81,7 @@ public func encode(_ payload:Payload, algorithm:Algorithm) -> String {
     return nil
   }
 
-  let header = encodeJSON(["typ": "JWT" as AnyObject, "alg": algorithm.description as AnyObject])!
+  let header = encodeJSON(["typ": "JWT", "alg": algorithm.description])!
   let payload = encodeJSON(payload)!
   let signingInput = "\(header).\(payload)"
   let signature = algorithm.sign(signingInput)