update user agent

[amychen1776]

Description

Since our name change happened in June 2020, I wanted to update the user agent to reflect that.

Checklist

• [ x] I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have updated the CHANGELOG.md and added information about my change to the "dbt-spark next" section.

[cla-bot]

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CLA has not been signed by users: @amychen1776

[amychen1776]

I can't seem to find the "dbt-spark next section in the Changelog.md, did this get removed?

[jtcohen6]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[jtcohen6]

Thanks @amychen1776! I can handle the changelog entry, there's a bit of cleanup to do in that file anyhow