Where is move op?

[smmoosavi]

When I try using move, following error shown:
code:

var list1 = Immutable.fromJS([1, 2, 3, 4]);
var ops = Immutable.fromJS([
    {op: 'move', from: '/2', path: '/3'}
]);
var list2 = patch(list1, ops);

/path/to/project/node_modules/immutablepatch/src/patch.js:76
    throw new Error('sequence patch Error, unknown op: ' + op);
    ^

Error: sequence patch Error, unknown op: move
    at sequencePatch (/path/to/project/node_modules/immutablepatch/src/patch.js:76:11)
    at anyPatch (/path/to/project/node_modules/immutablepatch/src/patch.js:92:12)
    at eachPatch (/path/to/project/node_modules/immutablepatch/src/patch.js:105:16)
    at Object.<anonymous> (/path/to/project/index.js:30:14)
    at Module._compile (module.js:434:26)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:475:10)
    at startup (node.js:117:18)