Ran npm update to fix nan warnings

[nyxtom]

Issues

Node.js 14+ issues a number of deprecated warnings for the nan package, so update the 'nan'.

../node_modules/nan/nan_typedarray_contents.h:34:43: warning: 'GetContents' is deprecated: Use GetBackingStore. See
      http://crbug.com/v8/9908. [-Wdeprecated-declarations]
      data   = static_cast<char*>(buffer->GetContents().Data()) + byte_offset;

Changes

• Ran npm update to fix warnings for package nan (updated to 2.15.0)