Update Logger.swift to prevent error passing interpolated strings
Update Logger.swift to prevent error passing interpolated strings

Change the type of message parameter from StaticString to String for the logMessage function in order to accept interpolated strings.

For example, the error ```Cannot invoke 'logMessage' with an argument list of type ...``` occurs when building an app with the below code snippet contained in a separate ViewController.swift that calls the logMessage function using an interpolated string in the message parameter, however no error occurs when a plain string with no interpolation is used.

```
    #if DEBUG
        Logger().logMessage("Logged in... (Existing Access Token: \(FBSDKAccessToken.currentAccessToken()))", LoggerLevels.Success, file: self.getClassName(), method:String(__FUNCTION__), line: __LINE__)
    #endif
```

But then after changing the logMessage function of Logger.swift to accept a message parameter with type ```String``` instead of ```StaticString``` and building the app with the above code snippet containing the interpolated string, no errors occur, and the console outputs the following:

```Logged in... (Existing Access Token: <FBSDKAccessToken: 0x7fb20b726330>) [ViewController:viewDidLoad():61] [18:58:43.GMT-3]```
jandro-es/Bluebird