Fix CHANGELOG issue links

[moCello]

Resolves: #688

[codecov]

Codecov Report

Merging #693 (d24ff39) into master (f5fa056) will decrease coverage by 1.35%.
The diff coverage is 98.48%.

❗ Current head d24ff39 differs from pull request most recent head 6e71182. Consider uploading reports for the commit 6e71182 to get more accurate results

@@            Coverage Diff             @@
##           master     #693      +/-   ##
==========================================
- Coverage   82.03%   80.68%   -1.36%     
==========================================
  Files          54       47       -7     
  Lines        4437     3505     -932     
==========================================
- Hits         3640     2828     -812     
+ Misses        797      677     -120     

Impacted Files	Coverage Δ
src/constraint_system/constraint.rs	32.91% <ø> (+0.81%)	⬆️
...raint_system/ecc/curve_addition/fixed_base_gate.rs	100.00% <ø> (ø)
...nt_system/ecc/curve_addition/variable_base_gate.rs	93.75% <ø> (ø)
src/constraint_system/logic.rs	93.02% <ø> (ø)
src/constraint_system/range.rs	73.07% <ø> (ø)
src/error.rs	0.00% <ø> (-7.15%)	⬇️
src/lib.rs	100.00% <ø> (ø)
src/permutation.rs	89.54% <ø> (-0.25%)	⬇️
src/proof_system/linearization_poly.rs	99.30% <ø> (-0.20%)	⬇️
src/proof_system/quotient_poly.rs	98.52% <ø> (-0.35%)	⬇️
... and 18 more

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[t00ts]

LGTM!