v1.10.3

v1.10.3 of Mailspring with Linux-firned systray icons (and automatic light/dark icon as long as the desktop supports it)

v1.10.2-b2

Pretty functional version that automatically changes the tray icon for dark color/light color under Linux. Known limitations:

1. the icon change may not be instantaneous, as there is no callback. Changing folder should be enough to trigger it
2. not tested on Win/macOSX, should be just harmless

v1.10.2-b1

Mailspring 1.10.2 with different tray icon and a probably non-functional patch to make it adapt to dark/light color scheme