upgrade.py: when invoked without params, print same style message as -h
upgrade.py: when invoked without params, print same style message as -h

SpiderLabs/owasp-modsecurity-crs,umarfarook882/owasp-modsecurity-crs,coreruleset/coreruleset,coreruleset/coreruleset,coreruleset/coreruleset,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,umarfarook882/owasp-modsecurity-crs,coreruleset/coreruleset,umarfarook882/owasp-modsecurity-crs,umarfarook882/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs,coreruleset/coreruleset,coreruleset/coreruleset,umarfarook882/owasp-modsecurity-crs,SpiderLabs/owasp-modsecurity-crs