Added high level change description to release notes.
Added high level change description to release notes.

jerome79/OG-Platform,nssales/OG-Platform,McLeodMoores/starling,ChinaQuants/OG-Platform,jeorme/OG-Platform,codeaudit/OG-Platform,jeorme/OG-Platform,DevStreet/FinanceAnalytics,DevStreet/FinanceAnalytics,DevStreet/FinanceAnalytics,codeaudit/OG-Platform,codeaudit/OG-Platform,jeorme/OG-Platform,McLeodMoores/starling,nssales/OG-Platform,nssales/OG-Platform,codeaudit/OG-Platform,jeorme/OG-Platform,McLeodMoores/starling,ChinaQuants/OG-Platform,jerome79/OG-Platform,jerome79/OG-Platform,jerome79/OG-Platform,nssales/OG-Platform,McLeodMoores/starling,ChinaQuants/OG-Platform,DevStreet/FinanceAnalytics,ChinaQuants/OG-Platform