support redux-persist v5

[sytolk]

fix #2

[ivankukobko]

@Osedea any chances this PR will be merged soon?

[eduardojunio]

@sytolk doesn't work, I'm getting this error:

storage.getItem is not a function

My environment:

  {
    "realm": "^2.2.12",
    "redux-persist": "^5.9.1"
  }