Output local or UTC time

Version 1.1.8

New feature:

• 407f12d client: output local time by default, add -z/--zulu for UTC

Housekeeping:

• 02212e2 Switch to std::time and drop use of 'time' crate
• d42db50 Upgrade several dependencies to latest versions
• e13d6fd Remove deprecated std::error::Error::description calls
• 32f11aa Update Dockerfile to Rust 1.42