Expose the list of available countries

[meeDamian]

Addresses #5

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This change is 

[codecov-io]

Codecov Report

Merging #7 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #7   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           2      2           
  Lines          62     62           
=====================================
  Hits           62     62

Impacted Files	Coverage Δ
lib.js	100% <ø> (ø)	⬆️
main.js	100% <100%> (ø)	⬆️

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[coveralls]

Coverage remained the same at 100.0% when pulling 27a6101 on countries into 70e3c17 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 27a6101 on countries into 70e3c17 on master.