Update CHANGELOG.md
Update CHANGELOG.md

updates for 1.7.1 release
RanjithKumar5550/RanMifos,Vishwa1311/incubator-fineract,RanjithKumar5550/RanMifos,Vishwa1311/incubator-fineract,RanjithKumar5550/RanMifos,Vishwa1311/incubator-fineract