Version 2.1.0

Added:

• Nightmode (85e17f7)
• Hide the topbar of the Frontail log in the settings (5a0d6f0, f77d8af)
• Review dialog (via Google in-App Review API) (ea857e0)

Enhancements:

• widened space above input fields on main fragment (0c83899)
• improved about page (d176e07)
• removed "Connecting..." toast on WebView start (9ddc0c2)