Slack for Windows

What's new in this version:

Features:
- Mailspring has been approved for read-write access to the Google People API and you can now manage contacts in Google accounts! Mailspring will ask you to go to Preferences > Accounts and click "Re-authorize" to grant access to this additional permission before editing contacts.
- We no longer use is-online and DNS checks to verify that the app is online. Instead, Mailspring checks that it can reach your actual IMAP / SMTP mail servers
- Mailspring now supports plaintext mail display and composition! It can be enabled via a new setting, or for a single draft by holding Alt/Option when creating it. Most composer features are disabled in ths mode

Fixes:
- Mailspring now prompts you to confirm that you'd like to delete folders and labels
- When pasting a table from Excel or other forms of HTML that use <style> tags, Mailspring inlines the CSS and preserves it better in your message
- Adding and removing accounts no longer dismisses the app's preferences
- The performance of the composer has been greatly improved when there are a large number of recipients
- The "Never Translate German" dialog and other modals no longer freeze the app on some platforms
- Calendar attachments with times like "2019-11-12T::" are now rendered properly in the conversation view
- The Russian, Chinese, Latin American Spanish and French translations have been improved
- Scheduling reminders, etc. across the DST boundary now works properly in Brazil, which stopped using DST in 2019
- The default shortcut for deleting an empty draft is now Ctrl/Cmd + Escape, which works within the text editor
- Mailspring's email address autolinking no longer includes some UTF-8 control characters (most notably  ) in the email address link

Misc:
- You can now type IMAP configurations with a port number that starts with a default (eg: 2525 for SMTP)
- You can now select text in the contact sidebar (URLs, bios, addresses, etc.) to copy/paste it
- Preferences > Shortcuts is now split into two columns on wide displays