Merge pull request #8 from usds/cwren-usds/release_process

0.1.4: backport to python 3.7.1

change semantics of credential loading

sometimes it's useful to override username or password indepenently.
also assume provided credentials as arguments are meant to override environemnt.

Merge pull request #4 from usds/cwren-usds/release_process

document release process and try again

bump pyproject version number

don't create log file until there is output

add golden files so tests pass out of the box