[feat] make serial_batch_inversion_and_mul public (#971)

* Update mod.rs

* Update CHANGELOG.md

Author: flyq

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## Pending
 
+
+- [\#971](https://github.com/arkworks-rs/algebra/pull/971) (`ark-ff`) Make serial_batch_inversion_and_mul public.
 - Consolidated logic into `bitreverse_permutation_in_place` and made it public.
 - Remove redundant type constraints from `Pairing::G1Prepared`.
 

ff/src/fields/mod.rs

@@ -378,7 +378,7 @@ pub fn batch_inversion_and_mul<F: Field>(v: &mut [F], coeff: &F) {
 
 /// Given a vector of field elements {v_i}, compute the vector {coeff * v_i^(-1)}.
 /// This method is explicitly single-threaded.
-fn serial_batch_inversion_and_mul<F: Field>(v: &mut [F], coeff: &F) {
+pub fn serial_batch_inversion_and_mul<F: Field>(v: &mut [F], coeff: &F) {
     // Montgomery’s Trick and Fast Implementation of Masked AES
     // Genelle, Prouff and Quisquater
     // Section 3.2