Update browserlist in package.json

[Nooshu]

Consider removing last 2 versions from the browserlist in package.json. This can be harmful because it says "We support the last 2 versions of every browser", but this includes very old and outdated browsers. More information on this can be seen in this article here. The article also gives and alternative list, although I don't think this is appropriate so it needs a little more consideration.

"browsers": [
  ">0.25%",
  "not ie 11",
  "not op_mini all"
]

Initial discussion started on the Design System repo here.