v2.1.2

• Added a new weather data service, Weather Underground, so that a Dark Sky API key is not needed. Dark Sky is still an option as well, as either a backup (by default) or as a primary weather service.
• Equinox/solstice times are now displayed.
• A small change in rain/snow probability graphics, dependent on test of available emoji.
• Fixed display of indoor signal meter.
• Update of rpi-acu-rite-temperature library helps fix possible caching of corrupted data after a wireless sensor has stopped providing data.
• Fixed incorrect Weather Underground timestamp.
• Fixed Safari-only bug where signal meter graphic became clipped when tinted blue.