updated the URL of the Features App sample in the readme
updated the URL of the Features App sample in the readme

wso2/carbon-uuf,this/carbon-uuf,this/carbon-uuf,wso2/carbon-uuf,sajithar/carbon-uuf,wso2/carbon-uuf,wso2/carbon-uuf,sajithar/carbon-uuf,this/carbon-uuf,this/carbon-uuf