Function from_json 

pub fn from_json(json: &Value) -> Result<ValueEnvelope>

Parse an envelope from JSON

Example

use shape_wire::{to_json, from_json, ValueEnvelope};

let env = ValueEnvelope::bool(true);
let json = to_json(&env);
let decoded = from_json(&json).unwrap();
assert_eq!(env.value, decoded.value);