Reactive charm no longer deploys with 0.18.3

[cmars]

My reactive charm built with layer:basic no longer installs. We've isolated the regression to the upgrade from charmhelpers 0.18.2 to 0.18.3.

2017-12-13 17:42:07 DEBUG install Traceback (most recent call last):
2017-12-13 17:42:07 DEBUG install   File "/var/lib/juju/agents/unit-livepatch-health-0/charm/hooks/install", line 8, in <module>
2017-12-13 17:42:07 DEBUG install     basic.bootstrap_charm_deps()
2017-12-13 17:42:07 DEBUG install   File "lib/charms/layer/basic.py", line 58, in bootstrap_charm_deps
2017-12-13 17:42:07 DEBUG install     cfg = layer.options('basic')
2017-12-13 17:42:07 DEBUG install AttributeError: module 'charms.layer' has no attribute 'options'
2017-12-13 17:42:07 ERROR juju.worker.uniter.operation runhook.go:113 hook "install" failed: exit status 1