is-promise post mortem

Last Saturday, I made the decision to try and catch up on some of the many contributions to my open source projects. One of the first pull requests I decided to merge was one that adds a TypeScript declaration file to is-promise.

After merging it, I decided it would also be a good time to update the module to support ES Module style imports. Specifically I wanted to be able to import isPromise from 'is-promise'; without needing to have synthetic default imports enabled. After this, I ran the tests, which passed, and published a new version.