Merge pull request nevalang#886 from nevalang/version_0_31_1

feat(version): 0.31.0 -> 0.31.1

Merge pull request nevalang#870 from nevalang/readme-update

`errors` package

Merge pull request nevalang#850 from nevalang/cli-minor-refactor

Cli minor refactor

Merge pull request nevalang#836 from Mr-Ao-Dragon/fix/lock/removelock

fix: File lock not released properly

Merge pull request nevalang#822 from nevalang/bump_version_030

feat(version): 0.29.1 -> 0.30

Merge pull request nevalang#817 from nevalang/fix_desugarer_meta

Fix desugarer meta

Merge pull request nevalang#799 from nevalang/tutorial-defer

Props drilling, anonymous Interfaces, working filter, meta everywhere, etc

Merge pull request nevalang#795 from nevalang/tutorial-fixes

Tutorial fixes

Merge pull request nevalang#793 from nevalang/bump_version_281

feat(version): bump to 0.28.1

Merge pull request nevalang#787 from nevalang/tutorial_switch

wip(tutorial:switch)