I suggest you split up your deb package to two:
- 3rd-party libs/tools/apps
- code you added
Usually only part 2 changes, which is much smaller, so no need to download almost 70MB every time I want to be up to date with all the greatest. (Of course package 2 would depend on package 1).
Also on the main page of atom.io please add the current version number beside the download. Same for the downloaded deb file:
atom-amd64.deb => atom-amd64-0.186.0.deb
Easier for updaters.
Please consider this.