fix: reexport Fractions

problems so thsi fixex

src/lib.rs

@@ -1,4 +1,4 @@
-use fractions::{Fraction, FractionError};
+pub use fractions::{Fraction, FractionError};
 use std::cmp::min;
 use std::error::Error;
 use std::fmt::{self, Debug, Display};