immerMap function

[achung89]

possibly add an immer implementation that can be used with map/filter/forEach

ex. 
const immerMap = (fn) => 
  (item) => immer( item, fn )

var arr = [['1'], ['2'], ['3']];
arr.map(immerMap((item) => {item.push('new')}));

[hex13]

this is why we could use of swap arguments and currying.

(proposal)

arr.map(immer((item) => {item.push('new')}));

[mweststrate]

Implemented in 0.4.0. See https://github.com/mweststrate/immer#currying. The first example covers the above