Update CONTRIBUTING.md
Update CONTRIBUTING.md

To base changes on v3.2/dev.
SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset