canvas-prebuilt download link 404

```
node-pre-gyp WARN Using needle for node-pre-gyp https download
node-pre-gyp ERR! install error
node-pre-gyp ERR! stack Error: 404 status code downloading tarball https://github.com/chearon/node-canvas-prebuilt/releases/download/v1.6.11/canvas-prebuilt-v1.6.11-node-v67-linux-x64.tar.gz
```
