update cloudpathlib upper pin to 1.0.0

[svlandeg]

Description

Assuming that minor versions won't be breaking.

Fixes #67

Types of change

fix

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the test suite, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[svlandeg]

Test suite ran fine with cloudpathlib-0.17.0, and before there was no issue upgrading to 0.16.0 either, so we'll go ahead and loosen the upper pin.