Added support for 0.96

Added support for 0.96. For Hass <0.96 use 0.2.0.

Fix entity notation usage to solve conflict with unused entities.

Breaking change

Changed entity notation to solve conflict with unused entities. Entity objects or Entity ID strings can now be used to define the heat and cool entities.

Example usage:

Using entity objects

cards:
  - type: custom:dual-thermostat
    name: Downstairs
    entities:
      - entity: climate.downstairs_cool
        type: cool
      - entity: climate.downstairs_heat
        type: heat
    fan_control: true
    min_slider: 60
    max_slider: 80

Using string (First provided entity will define to the cool entity)

cards:
  - type: custom:dual-thermostat
    name: Downstairs
    entities:
      - climate.downstairs_cool
      - climate.downstairs_heat
    fan_control: true
    min_slider: 60
    max_slider: 80