Updated changelog

Cleaned configs to avoid bad starting coordinate etc.

Added 4.2 release notes to default configs

Updated ROADMAP, CHANGELOG and versioning i package.json files.

npm up and v4.1.5

Keeping changelog up-to-date.

Suddenly, write-excel-file started requiring @babel/runtime as a dep,…

… so I had to add it. Also, minor fix in Dockerfile to build using legacy peer deps (of react-smooth-dnd, that still 'requires' React 16.

Update ROADMAP.md

Added info on 4.2