v0.3.0

Changes since v0.2.0:
- concurrency with dynamically sized worker pool
- update dependencies
- dispatcher: don't wait at the first iteration
- increase number of characters shown in table cell
- use italic font in form descriptions
- email messageIDs 16 bytes of entropy instead of 16 chars
- graceful shutdown on window close and termination signals

v0.2.0

Changes since v0.1.0:
- feature: custom HELO host name
- fix: do not accept port number 0 in SMTP
- fix bug that didn't show some broadcast as 'running'
- improve printed details for broadcasts
- replace text with icons in broadcasts' buttons
- remove 'File' column from broadcasts table
- make SMS sending limits required
- feature: add start/stop buttons for broadcasts

v0.1.0

first release