[BUG] remove-placeholder with top-country breaks the selection of country in country-select

[kjesien]

Having remove-placeholder with top-country like this:

<country-select
  v-model="country"
  :country="country"
  top-country="US"
  remove-placeholder
/>

breaks the ability to change the selection.
Calling onChange in countries computed property in line 69 causes constant re-selection of top-country.

BTW - computed properties should not have such side effects like emission of events.