Updated to Factorio 2.1

Adds Electric Stone Furnace recipe when electric circuits are unlocked.

Crafting time: 0,5s
Crafting speed: 2
Polution: 1
Energy consumption:
- Drain: 1 kW
- Consumption: 90kW
Ingredients:
- 1x Stone furnace
- 1x Electronic circuit
- 2x Copper cable