Incompatibility with IE11

[Betree]

Hello,

Our bug tracker noticed a recurring error on IE11 (and some other old browsers that don't support arrow functions):

These arrow functions were introduced in #175, before that we were not noticing any error coming from this library.

Possible solutions:

• Transpile the code with Babel
• Refactor the functions introduced in feat: Allow alternative country name spellings via array #175 to legacy functions. Should be fairly simple as there are only 4 of them.

[Betree]

The fix made in #194 is actually not enough, we now get an error for Const must be initialized.

How would the maintainers feel about transpiling the code with Babel or Typescript? I'd be happy to work on that topic, but would love to get some directions on which approach you prefer before doing so.

[ghost]

Hi team, we experienced the same problem. Is there any update on this issue?

[KingDarBoja]

I assume this can be solved via #218

EDIT: Can you guys test my linked PR to see if that works? Thanks!