IE Object.assign not available

[stanleynguyen]

Object.assign is not available on IE. The fix is simple as only a polyfill is necessary

if (typeof Object.assign != 'function') {
  Object.assign = function(target) {
    'use strict';
    if (target == null) {
      throw new TypeError('Cannot convert undefined or null to object');
    }

    target = Object(target);
    for (var index = 1; index < arguments.length; index++) {
      var source = arguments[index];
      if (source != null) {
        for (var key in source) {
          if (Object.prototype.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }
    }
    return target;
  };
}

[Cam]

@stanleynguyen nice one. Personally I don't think we should change the package to support IE. But I'd like to keep this issue open, and possible pinned, so that others can implement support for IE as necessary.