Adds .default so create function could be found

[dave-smartystreets]

Adds .default to code to continue using Common JS

[greg5green]

Just in case anyone else comes here after seeing an error of Uncaught TypeError: Cannot read properties of undefined (reading 'create') coming from line 9 of HttpSender.js after upgrading their version of this SDK, you might need to update whatever bundler you're using in your project to handle the cjs file extension.

Axios switched their file extension somewhere between 0.26.1 and 1.62. We were handling js, mjs, ts, but not cjs. Once updating our webpack config to handle this, everything worked great!