Improvement - get local pressure and temperature from openweather

[arsab]

There is possibility to enter local pressure to have accurate altitude.

It would be even nicer to get it directly from actual measurements directly with very little data transmission.

free information:
https://openweathermap.org/current

Simple parser:
https://github.com/sfrwmaker/openweathermap.org-ESP8266/blob/master/OpenWeatherMap.cpp