Convert bytes directly to Data instead of UnsafePointer API (#83)

* Convert bytes directly to Data instead of UnsafePointer API

Using a pointer to an array created via the UnsafePointer initializer is
undefined and isn't guaranteed to be valid.

* Use non-deprecated initializer for Data

Sources/CryptorRSA/CryptorRSAUtilities.swift

@@ -286,7 +286,7 @@ public extension CryptorRSA {
 		index += 1
 
 		let strippedKeyBytes = [UInt8](byteArray[index...keyData.count - 1])
-		let data = Data(bytes: UnsafePointer<UInt8>(strippedKeyBytes), count: keyData.count - index)
+        let data = Data(strippedKeyBytes)
 		return data
 	}