Bump requests to 2.20.0, circle to cci2.0(stitchdata#11)

* Bump requests from 2.12.4 to 2.20.0

Bumps [requests](https://github.com/requests/requests) from 2.12.4 to 2.20.0.
- [Release notes](https://github.com/requests/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/master/HISTORY.md)
- [Commits](psf/requests@v2.12.4...v2.20.0)

Signed-off-by: dependabot[bot] <[email protected]>

* Update setup.py

* update circle to cci2.0

* use unittest

* unittest

* Back to the latest

* version bump

setup.py

@@ -4,7 +4,7 @@
 import subprocess
 
 setup(name="stitchclient",
-      version="0.6.0",
+      version="0.7.0",
       description="A Stitch API client for Python",
       author="Stitch",
       author_email="[email protected]",