Stable promotion of 0.1.5-beta. No code changes from the beta; this release
drops the pre-release suffix now that the newline-as-statement-separator
behavior change (SPEC §4) has been validated against Netclaw's live gate
evaluator. Consumers on 0.1.5-beta can upgrade directly.
See the 0.1.5-beta notes below for the full list of changes in this version.