Can't Specify Two Letter Country Code in Weather Skill

[Alexanderkocha]

Steps to reproduce

1. Open Dicio and navigate to weather skill
2. Change location to a city with a specific country code like "Newbridge, AU"
3. Ask for the weather, the city won't be found

Cities that share a name with a different city in another country cannot be distinguished correctly.

A city, for example, like Newbridge in Australia, would have the OpenWeatherMap code of "Newbridge, AU", however the result in Dicio would be "Newbridge AU" which doesn't match any city name.

This is probably caused by the removal of punctuation in the city string, which is related to #115