#890 follow-up: exporting locales for isFloat

[profnandaa]

For my #890 PR, I intentionally left out isFloat since I noticed that it does not throw an error for "unsupported" locales but rather falls back on a default.

https://github.com/chriso/validator.js/blob/master/src/lib/isFloat.js#L7

Should we add throwing an error now since that has been the pattern for the rest, or will we be risking backward incompatibility (before line 7)?

// check for unsupported locale
// for uniformity with other locale-based functions
if (options.locale && !decimal[options.locale]) {
  throw new Error(`Invalid locale '${options.locale}'`);
}

OR

Should we just export the locales alone isFloatLocales and leave everything as is?

[profnandaa]

@chriso ^

[chriso]

Fixed by #892.