precompiled packages targeting electron are not available

I have developed and tested a package using node-canvas. Everything worked fine. Now I am trying to use my package in another project that is targetting electron environment. Here the download of the canvas package fails because pre-built packages targeting that environmet are not available.

## Issue or Feature
Need support for pre-built binaries for electron.

## Steps to Reproduce
Use the Canvas package from package.json dependencies section on a project that targets electron environment.

error:
error D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas: Command failed.
Exit code: 1
Command: node-pre-gyp install --fallback-to-build
Arguments:
Directory: D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas
Output:
node-pre-gyp info it worked if it ends with ok
node-pre-gyp info using node-pre-gyp@0.11.0
node-pre-gyp info using node@10.15.3 | win32 | x64
node-pre-gyp WARN Using request for node-pre-gyp https download
node-pre-gyp info check checked for "D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas\build\Release\canvas.node" (not found)
node-pre-gyp http GET https://github.com/node-gfx/node-canvas-prebuilt/releases/download/v2.6.0/canvas-v2.6.0-electron-v4.2-win32-unknown-x64.tar.gz
node-pre-gyp http 404 https://github.com/node-gfx/node-canvas-prebuilt/releases/download/v2.6.0/canvas-v2.6.0-electron-v4.2-win32-unknown-x64.tar.gz
node-pre-gyp WARN Tried to download(404): https://github.com/node-gfx/node-canvas-prebuilt/releases/download/v2.6.0/canvas-v2.6.0-electron-v4.2-win32-unknown-x64.tar.gz
node-pre-gyp WARN Pre-built binaries not found for canvas@2.6.0 and electron@4.2.9 (electron-v4.2 ABI, unknown) (falling back to source compile with node-gyp)
node-pre-gyp http 404 status code downloading tarball https://github.com/node-gfx/node-canvas-prebuilt/releases/download/v2.6.0/canvas-v2.6.0-electron-v4.2-win32-unknown-x64.tar.
gz

D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas>if not defined npm_config_node_gyp (node "C:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..
\node_modules\node-gyp\bin\node-gyp.js" clean ) else (node "" clean )
gyp info it worked if it ends with ok
gyp info using node-gyp@3.8.0
gyp info using node@10.15.3 | win32 | x64
gyp info ok

D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas>if not defined npm_config_node_gyp (node "C:\Program Files\nodejs\node_modules\npm\bin\node-gyp-bin\\..\..
\node_modules\node-gyp\bin\node-gyp.js" configure --fallback-to-build --module=D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas\build\Release\canvas.node -
-module_name=canvas --module_path=D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas\build\Release --napi_version=3 --node_abi_napi=napi --napi_build_version
=0 --node_napi_label=electron-v4.2 ) else (node "" configure --fallback-to-build --module=D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas\build\Release\c
anvas.node --module_name=canvas --module_path=D:\src\azuredatastudio\extensions\integration-tests\node_modules\canvas\build\Release --napi_version=3 --node_abi_napi=napi --napi_b
uild_version=0 --node_napi_label=electron-v4.2 )

## Your Environment
* Version of node-canvas (output of `npm list canvas` or `yarn list canvas`):
$ npm list canvas
adstest@0.0.3 D:\src\adstest
`-- chartjs-node-canvas@2.4.0
`-- canvas@2.5.0

* Environment (e.g. node 4.2.0 on Mac OS X 10.8):
$ node -v
v10.15.3

Windows Version 1903 (OS build 18362.239)