enhance: bump version to 1.6.3

chore: Update logo image for banner

fix: A rare start crash after the Mac restarts

Sometimes, Lepton crashes when Mac tries to restore its
previous apps state after restart. If Lepton is running
before the previous shutdown, the Mac sends it 'activate'
event when restarts, which however doesn't work because
Lepton's mainWindow is not generated.

Update version to v1.6.0

fix: users not able to logout

update version to 1.5.0

fix: replace web-based localStorage with electron-json-storage-sync h…

…ackjutsu#143

fix file-expand arrow direction

I think there are reverse

enhance: add Sticker.js-style to profile image hackjutsu#189

add contributor in setting and readme