Updated version for next release cycle
Clarify :not-supported exception in readme
Update to use pallet-aws 0.2.3
Remove commented code
Check each exception in cause chain for expected?

When checking to see if an exception is expected, check each cause
exception, not just the outer exception.
Fix usage of TEST_ENV_THREAD
Updated project.clj, release notes and readme for 0.1.7
Merge release/0.1.7