Return Moving Average for Bitcoin Price (in USD) and variation for a chosen period of 100 or 200 days.

Example:

{
"BTC_moving_average_200_days":"46,250.74"
"BTC_variation_in_200_days":"+72.38%"
}

Another EndPoint returns 30 days volatility of bitcoin price.

Exemple:

{
'Volatility_in_30_days':  '2,78%'
}
```