Fixes

As mentioned in axios's example, in order to use axios with types (which a lot of people are now doing), the .default import needs to be used.

This doesn't impact non-typescript based users, but means typescript users can actually use sendgrid again.

Closes #1426

Checklist

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• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
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  - [ ] I have added tests that prove my fix is effective or that my feature works
  - [ ] I have added the necessary documentation about the functionality in the appropriate .md file
  - [ ] I have added inline documentation to the code I modified

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