fix: avoid select null status

change postpone related from now date by default

doc: README

wip: colors

Merge pull request #61 from mazer-dev/60-add-invoice-payment-date

feat(#60): added payment date to invoice and layout improvements

feat: opened invoices overview

feat: show on list table if task has a running work sesssion

Merge pull request #49 from mazer-dev/48-invoice

48 invoice

Merge pull request #47 from mazer-dev/release-0-2-readme

Update README.md release 0.2.0

feat: subscription tracker better table