OSM Maps for locations

[leha-bot]

Feature description

As requested by @SaphireLattice in our tg chat, I suggest to add OSM maps. The sample reference is located here: https://wiki.openstreetmap.org/wiki/Tiles

Feature check-list

• [X] This feature is unique (at least I don't know any messengers that use OSM directly);
• [X] This feature doesn't violate the Telegram Terms of Service (simple cosmetic addition).

Related to #137.

[leha-bot]

OSM servers have their own usage policy. Need to investigate