Fix timezone support on postgres. Fixes #35

[johnf]

Pull Request Are you a current Fivetran customer? Yes. John Ferlito, Cofounder, Gladly Pty Ltd

What change(s) does this PR introduce? Fixes issues with time zone conversion for postgres

Did you update the CHANGELOG?

• [x] Yes

Does this PR introduce a breaking change?

• [ ] Yes (please provide breaking change details below.)
• [x] No (please provide an explanation as to how the change is non-breaking below.)

If someone on postgres has a timezone set then the package fails to work anyway.

Did you update the dbt_project.yml files with the version upgrade (please leverage standard semantic versioning)? (In both your main project and integration_tests)

• [x] Yes

Is this PR in response to a previously created Bug or Feature Request

• [x] Yes, Issue/Feature #35
• [ ] No

How did you test the PR changes?

• [ ] CircleCi
• [x] Local (please provide additional testing details below) Used the package on my local model and I can now use the stripe module with atimezone set

Select which warehouse(s) were used to test the PR

• [ ] BigQuery
• [ ] Redshift
• [ ] Snowflake
• [x] Postgres
• [ ] Databricks
• [ ] Other (provide details below)

Provide an emoji that best describes your current mood :penguin:

[fivetran-joemarkiewicz]

Thanks so much for opening this PR @johnf!! 🙌

I will have someone from my team review this PR in the coming sprint (starting Thursday) and will let you know if we have any questions before merging and including in our next release 😄