Warning: use {.base.} for base methods; baseless methods are deprecated
I started using NiGui.
However, the following warning appears when the compile command is executed.

```
C:\Users\nnahito\Desktop\NiGui-master\src\nigui.nim(466, 8) Warning: use {.base.} for base methods; baseless methods are deprecated [UseBase]        
C:\Users\nnahito\Desktop\NiGui-master\src\nigui.nim(477, 8) Warning: use {.base.} for base methods; baseless methods are deprecated [UseBase]        
C:\Users\nnahito\Desktop\NiGui-master\src\nigui.nim(497, 8) Warning: use {.base.} for base methods; baseless methods are deprecated [UseBase]
.....
```

Is this all right?


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My environments:

- Windows10 Home
- Nim Compiler Version 1.0.0 [Windows: amd64]