Update README.md and changelog for 1.3.1

[amirbenv]

No description provided.

[codecov]

Codecov Report

Merging #509 (cde0357) into master (8e3e41b) will increase coverage by 2.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #509      +/-   ##
==========================================
+ Coverage   73.73%   75.96%   +2.23%     
==========================================
  Files          93       94       +1     
  Lines        2151     2276     +125     
==========================================
+ Hits         1586     1729     +143     
+ Misses        429      403      -26     
- Partials      136      144       +8     

Impacted Files	Coverage Δ
...iac-providers/terraform/commons/module-download.go	100.00% <0.00%> (ø)
...viders/terraform/commons/remote-module-download.go	67.85% <0.00%> (ø)
pkg/policy/opa/engine.go	61.57% <0.00%> (+1.38%)	⬆️
pkg/iac-providers/terraform/commons/load-dir.go	84.69% <0.00%> (+2.00%)	⬆️
.../iac-providers/terraform/commons/cty-converters.go	86.11% <0.00%> (+5.55%)	⬆️
pkg/iac-providers/terraform/commons/references.go	75.51% <0.00%> (+8.16%)	⬆️
...providers/terraform/commons/variable-references.go	81.66% <0.00%> (+16.66%)	⬆️
...ac-providers/terraform/commons/local-references.go	80.00% <0.00%> (+76.66%)	⬆️

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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