Add a change log

It would be awesome if a changelog.md was added and Github releases were used to keep track of changes.

A common practice is to track changes under a next version heading at the top of changelog.md, then when ready to release:

1. Do a commit bumping the version:

• New version in package.json.
• Rename the next heading in changelog.md to the new version.

1. Create a new Github release. Follow the “Tagging suggestions” in the sidebar, and copy-paste the markdown from the change log into the description.
2. Run npm publish.

You can see that process in action at jaydenseric/apollo-upload-client.

[fridays]

Great idea. Thank you for explaining so well.

[fridays]

I just made a github release using release, that was easy. Thanks again!