0.11.0: Now in TypeScript

This is semver major release, but we expect there will be minimal impact to existing users of the library.

Here's a list of notable changes:

• [semver major] Treat 4xx and 5xx responses as errors (#149)
• The module has been migrated to TypeScript. While there has been an effort to ensure that this doesn't introduce semver major differences, there is a possibility that minor differences exist as a result of transpilation.
• In a future release we will no longer support deep loading of files within this module. For example no semver guarantees are being provided for the internal directory layout of the module.