Native module Toast tried to override Toast for module name RCTToast. if this was your intention, set canOverrideExistingModule=true

在安卓上报这个错，在Toast.java中重写`canOverrideExistingModule`方法解决了这个问题，我用的是rn0.37

```
    @Override
    public boolean canOverrideExistingModule() {
      return true;
    }
```