Remove an optional dependency on symfony/intl

[jakzal]

Not sure where's this used in the library, but the current requirement prevents composer from installing it with Symfony 3.

[norberttech]

https://github.com/coduo/php-to-string/blob/master/src/Coduo/ToString/StringConverter.php#L70 here?

[jakzal]

Fine, I guess you wanted to support those people without the intl extension installed. It doesn't need to be a hard dependency.

Btw, specs won't pass with symfony/intl as it only support English locale.

[norberttech]

well maybe just remove it

[jakzal]

I think that's the best thing to do. If someone wants to substitute the intl extension with symfony/intl, they can always install it themselves.

PR updated.

[norberttech]

thanks ;*