Jaeger UI v1.4.0

Enhancements

• Dependency graph: Use directed edges (@Etienne-Carriere in #373)

• Trace detail: Show seconds in trace start time on the trace page (@tiffon in #430, with thanks to @leogomes for #403)

Fixes

• Trace detail: Fix handling of numeric strings in span tag values (@yntelectual in #436)

• Google Analytics: Fix GA filter category (@everett980 in #404)

Documentation

• Plexus: Add a real README for plexus (@tiffon in #425)

Chores & Maintenance

• Codebase: Add an ESLint rule requiring the names of interfaces to be prefixed with "I" (@tiffon in #411)

• General: Fix typo on README file (@leogomes in #402)