Missing license file

[scott]

The readme states the gem is licensed under MIT. Can you please add a LICENSE with the MIT license terms to the repo?

[sergey-alekseev]

The license file was deleted before the release – 99c607e#diff-6d6f69ab160d70085563c5d6eb87b978.

[sergey-alekseev]

For some reason it was added in #54 and reverted in #67.