ES6 const as part of exported code

[maxijb]

When installing this package vis npm, this line is imported containing the ES6 token const, which is breaking our build process in production, as uglifiers expect only ES5 code in node_modules.

h3-js/out/libh3.js

Line 36 in 5f07884

const h3 = libh3();

Please replace const with var, to make this safely importable via npm.