By Andrea Mandala MILAN (Reuters) -Shares in Italy’s Unipol Group fell 8% on Friday after the company, whose core business is insurance, set out plans to invest 500 million euros ($519 million) in technology and to build up its bancassurance business over the next three years. Shares in separately-listed insurance group UnipolSai fell 3%, with traders saying UnipolSai’s dividend target for the period to 2022-24 was lower than expected. Carlo Cimbri, who chairs both Unipol and UnipolSai, said that some investors had also speculated that the group could streamline its structure by merging the tw…