Hi, thanks for providing lo!

The RandomString functions exits with panic: runtime error: integer divide by zero if the charset only has a single element.

randStr := lo.RandomString(10, []rune{65})

This happens in this line and the divisor is calculated on this line. The reason for the zero value is that nearestPowerOfTwo returns 1 and log(1) is zero.

This may be an edge case (we use it in tests to force a predictable value) but still should be handled somehow.

Thanks!